ATLAS Accu-Shot BT37 Spike Feet Bipods Easily installed with the press of a stainless steel plunger, the Spikes deliver a singularly aggressive foot to support the bipod The Spike portion is approximately 1.45 long with the largest OD of approximately 1. Available in raw Stainless with black insert only. Weight is 2.7 ounce and are made in America.