Acratech Basic Quick Release Clamp with Rubberised Knobs and Double-Speed thread.

Acratech quick release clamps are compatible with plates from Arca-Swiss, Kirk, Wimberly, Really Right Stuff, Foba, etc.
Precision C.N.C. Machined from 6060-T-6 Aluminum.
Lightweight weighs only 3 1/2 ozs. (105g)
Beautiful satin black anodized finish.
Made in the U.S.A.
Knob is secured so it can not come loose and fall off.
Stainless steel fasteners.
3/8-16 thread
2 3/8 inch (60 MM) long
Patent pending.