Gravedigger™ 4-Blade Cut-on-Contact 100 g Screw-In Mechanical Broadheads (10775) by BloodSport®. 3 Pieces. Pick your cut to take down big game with the Gravedigger™ hybrid mechanical broadhead. In fixed-blade mode, the Gravedigger features a 1" blade with two 0.5" bleeders for precise in-flight performance with hard-hitting impact. Loosen the set screw to take advantage of the no-fail mechanical format. Two cross-opening blades stay closed in-flight, but deploy immediately upon entry for a maximum 1.75" cutting surface without critical energy loss.