The durable P-300 Cable tie installation tool easily cinches the tie around the product, then trims excess strap material on larger cable ties (120lb & 175lb). Simply cinch the cable tie around items to your desired bundle diameter. Insert the exposed cable tie strap into the slot by the cutting blade (top-down) through the tip of the gun. Squeeze the two larger handles together until the correct bundle tension is reached. Continue holding the two larger handles together and squeeze the cutting handle until the tie strap is cut off.