After extensive torture testing Short Action Customs manufactured the Modular Action Wrench bodies out of 4140 Alloy Steel with a super hard heat treat and protected with a Black Oxide finish. With the unique modified 3/8a ^2 square drive interface the wrench is tool-less and offers super quick wrench head changes. On the back end, there is a standard 5/8a ^2 Hex to work with any standard 6 point or 12 point socket. With a nominal .685a ^2 body diameter, it works with a large array of actions from Howa 1500's, Tikka T3's to the Surgeon XL magnum action.FeaturesWrench BodyLong Delrin BumperShort Delrin Bumper8/32 Set Screw