The RRS B2-FABN Screw-Knob Clamp with Strap Bosses 38mmfrom RRS B2-FABN Screw-Knob Clamp with Strap Bosses 38mmis a small, lightweight quick release with a knurled knob, which offers a better grip and more clamping pressure onto a plate. The clamp is compatible with many Arca-type camera plates, multi-purpose bars, camera bars, and L-brackets. There are three strap bosses located on the clamp. The first one is located on the opposite side of the screw-knob, and the other two strap bosses are perpendicular to the jaws of the clamp. Therefore, straps can be looped through, and the clamp becomes a convenient way of carrying your camera around your shoulder or your neck.

A convenient 1/4"-20 socket is located on the bottom of the clamp and gives the option of screwing in a swivel mount and adapting a sling strap. The 1/4"-20 socket also gives the option of adding quick release functionality to many ball heads and monopods that do not have a quick release system.

The clamp has a laser-engraved scale with 1mm increments, so a camera can be positioned precisely or to repeat a position. The clamp is made from CNC machined 6061-T6 aluminum and it has a black anodized type II finish.

Arca-Type Compatible Clamp    Built-In Bosses for Camera Straps    1/4"-20 Socket for Swivel Sling Mounts    Bottom Dovetail Design on the Clamp    Adds Quick Release Functionality

Arca-type compatible plate

Three built-in strap bosses for camera straps

1/4"-20 socket on the bottom of the clamp for Swivel Sling Mounts

Adds quick release function to a tripod or monopod

CNC machined 6061-T6 type II anodized black aluminum

Laser-engraved scale with 1mm increments

Related Questions and Answers

Q: 1. Are the two clamping jaws of this clamp strong enough to securely hold a variety of equipments?

A: Yes Really Right Stuff B2-Duo Sliding Screw-Knob Clamp (60mm) jaws are strong enough to hold a variety of equipment.

Q: 2. Thank you everyone for your response. But I'm still wondering: if I mount this on a flat surface, and that surface extends out past the bottom of the clamp (not to the knob, of course), does the diameter of the shaft allow for clearance so the clamp sits firmly on the flat surface? Sometimes I use clamps on something other than ball heads. Thanks again.

A: Yes, the bottom surface of the Really Right Stuff B2-Pro-II 60mm will seat flat on the camera support plate system similar to BH #PLPMPMT1009. However, the knob can not be under the same plate surface because it's larger than the clamp high. The knob is 25mm while the plate is only 18mm. I will recommend the BH #REB2LRII with the Level since this part is the same high as the clamp and won't interfere if you place your plate on a flat surface.

Q: 3. Is this compatible with Manfrotto MHXPRO-BHQ2?

A: You may consider purchasing the Desmond DBAD Female to Male Boss Adapter for Select Manfrotto Heads, B&H # DEDBAD, to connect the Really Right Stuff B2-Pro-II 60mm Screw-Knob Pro Clamp to the Manfrotto XPRO Magnesium Ball Head with 200PL-14 Quick Release Plate.

Q: 4. Will it work for on the tripod mount of my Nikkor 200-500 VR attached to a QD magpul swivel connector on my D850. The clamp makes me nervous. Will it hold?

A: If you have Arca compatible quick release plate it will work well , on this QD Load Capacity: 25 lb

Q: 5. Will this fit on the IFootage Cobra 3 C180F-P?

A: Really Right Stuff B2-mAS Screw-Knob Clamp has a 1/4"-20 female screw and iFootage Cobra 3 Carbon Fiber Monopod with Pedal-Release Mini Tripod Base has a 1/4"-20 Male screw so it should screw in. If you need any help, please feel free to start a live chat during business hours. An expert from our Pro-Photo department can virtually guide you over live video in the store. https://bhpho.to/3MLX2vU

Q: 6. Can this be used on the Gitzo Mini Traveler?

A: The Really Right Stuff B2-mAS Screw-Knob Clamp with 1/4"-20 Screw (38mm) can be used with the Gitzo Mini Traveler.

Q: 7. Can this rail be used as a nodal rail for panoramas?

A: No this is for macro use

Q: 8. Will this fit on a IFootage Cobra 3 C180F-P?

A: Yes, the Really Right Stuff B2-Pro-II 60mm Screw-Knob Pro Clamp can screw into the Really Right Stuff B2-Pro-II 60mm Screw-Knob Pro Clamp.

Q: 9. how wide are the three strap bosses? Will a 1" strap fit?

A: The side lugs of the Really Right Stuff B2-FABN Screw-Knob Clamp with Strap Bosses (38mm) will fit a 0.70" strap, the front lug is 0.98" max, and both are 0.125" thickness maximum.

Q: 10. What's the distance between the two outer mounting holes? I wanna mount this plate on a 322 ball head.

A: The two outer mounting holes on the RRS B2-Pro II 60mm Screw-Knob Pro Clamp are 30mm apart.