Omega Technologies OM2-651 Grip Scale with Slide replace Hi-Shear® reg; 2-651. The Omega Technologies OM2-651 Grip Scale with Slide may be purchased as an assembly. Slide can be removed if necessary and re-installed.Hi-Lok® Grip Scales from Omega Technologies serve two purposes. The thicker side of the grip scales measure the grip-length of Hi-Lok® and Hi-Lite® pins, Shear Lockbolts, structural screws, and bolts.