Internal micrometer adjustments lock positively to prevent accidental movement of sight setting. No obstructions to impair and blot out shooter's field of vision. Weighs only 1A 1/2 oz. Standard hole spacing to fit rifles factory drilled and tapped for receiver sight. Foolproof-TK comes equipped with target knobs. FP-94/36-TK Model fits Browning B-92; Higgins 30/30 Lever; Marlin 30/30, 36, 94, 93, .44 Mag & 44; Sear Centerfire Lever; Winchester 55 & 65, 64 & 94, 241. Mfg: Williams Gun Sight SPECS: Aluminum, black, anodized. Steel screws.