Machined from steel with black oxide finish, Staff-Lok™ Shaft Collar features integral hinge with conformal cam lever and knurled screw that provides fully adjustable clamping by hand. Unit incorporates mounting flat with countersunk drilled and tapped hole and 2 mounting holes on face for attaching sensors, cameras, and other devices. Offered in ½ –2 ½ in. ID sizes, collar provides repositioning without tools and is suited for breadboarding mechanical and optical systems.