Adds a touch of authenticity to pump and lever action rifles, whether they're used for hunting or Cowboy Action Shooting. Provides better sight definition and faster target acquisition in the field or on the range. Locates the aperture closer to the eye for a clear sight picture; longer sight radius increases accuracy. All steel construction with micrometer adjustments for windage and elevation. Folds to the rear for storage. Mounting screw set must be purchased separately. Fitting chart for Standard Peep Sights Find the correct mounting screw set for your model here. Mfg: Marble Arms SPECS: Steel, blued. Older guns may require drilling and tapping. Includes (2) A 1/2" diameter apertures: .055" (1.4mm) and .102" (2.6mm) size holes, and (1) A 3/4" diameter aperture with .032" (.81mm) hole. Savage 99 will not fit late rifles with top safety. Late r