Bolt Racker Handle for Ruger Mk I, II, III, and 22/45Study the Pictures to Match Your Bolt to the Correct "Type" Bolt Racker The Bolt Racker Handle makes cocking and clearing the action SO EASY. Install it either left or right handed and we have "Types" to fit all Ruger Mk I, II, III, and 22/45 factory bolts. Choose Your Type - Using the pictures above, compare the grip surfaces of your bolt...- Type 1 bolt grip surfaces are parallel to the bolt (They "square" with the bolt).- Type 2 bolt grip surfaces are at an angle to the bolt and they're 1-1/4" Wide (Large Dovetail).- Type 3 bolt grip surfaces are also at an angle but, they're 1-1/16th" Wide (Small Dovertail). Easy Installation - Slip it on and tighten the allen head screws.