INNERLOC 5 Blade Broadhead. 5 Blades, 135 Grain, 1 3/16" Cutting Diameter. 'INNERLOC' Broadheads feature the patented 'Innerloc Center Locking System' the MOST SECURE BLADE LOCKING SYSTEM AVAILABLE that make sure the blades stay in place regardless of the hit. INNERLOC Broadheads have all the features bowhunters demand; quality, accuracy, strength and devastating, hide slicing, bone shattering force.