The Bantam design is a compact and lightweight version of the famed Hogue ergonomic hand shape, fully exposing the backstrap and bottom of the frame. They offer comfortable concealability while providing a secure handhold. The two-piece one finger groove grip has ambidextrous palmswells and is fully relieved for speed loaders. Grips include grip screw for mounting. To differentiate between Round and Square Butt, measure the flat area on the very bottom of your grip. This is the surface that commonly has the serial number located on it. Round Butts will measure around 1" and Square Butts will be over 1 1/4".Notes:Will also fit the early I-Frame modelsDoes NOT fit Polymer Bodyguard models(BG38)Does NOT fit model 40 and 42 due to grip safety and different dimensions on the grip frame