HTOMT Practice Butterfly Knife with Sure Spring Latch,Butterfly Style Bottle Opener Dull Balisong Trainer, Unsharpened Butterfly Knife Comb for CS GO Training, Cool Gifts for Son Boys Friends Men Bottle opener offers the function and look of a butterfly knife,Eye catcher in the bar or a gag gift for your next party. No sharp edges, no offensive blade, it is perfect for learning how to use a real butterfly knife without hurting yourself. Overall Length : 9'' Folding Length: 5.3'' Comfortable handle with balance holes gives strong feeling in hand A free screwdriver is to adjust the tightness of knife handle. Do not worry the tightness problem.