BHC Series Precision Adjustment Screws provide smooth, precision adjustment for optical mounts. Hex-head adjustment screws mean there is no knob for inadvertent adjustment. A nylon-tipped setscrew, which provides secure locking of the adjustment screw can be positioned in any of three holes in the steel collet to allow easy access locking. The collet of these adjustment screws is threaded to allow secure mounting in custom or OEM designs.