Traditional screw-knob clamps are tried & true and can deliver slightly greater clamping force than our Lever Release clamps. Clamps have dual mounts: center socket is countersunk on top but also threaded 3/8"-16. Mount by spinning onto an exposed threaded post or with flat head screw from above (accept M6 or 1/4"-20, not 3/8"). These clamps are appropriate for mounting on:

• any head with exposed 3/8"-16 threaded post
• can drop onto a female socket tapped 1/4"-20 (for any RRS head) or metric 6 (for all others)
• any head with exposed 1/4"-20 threaded post - install a reducer bushing into the socket hole of the clamp
• any head with 3/8"-16 female socket - purchase our stainless steel 3/8"-16 stud
• B2-Pro fits Manfrotto 484RC2, 488, & 488RC2
• When clearance is an issue, choose our B2 LR II - the low-profile lever does not protrude above or below the clamp's profile.

1. Jaw Length: 2.4 inches / 60mm
2. Width (includes knob in closed position): 4.0 inches / 102mm
3. Height: 0.8 inches / 25mm
4. Weight: 4.1 ounces / 116g
5. Price: $80

B2-Pro is 60mm (2.36") long, one central countersunk 3/8"-16 socket, two outboard 1/4"-20 sockets spaced 1.2"/30mm apart on center, captive knob, centering index marks, 3.8oz/116g