The Toughbuilt 7.6cm Seamer features 0.635cm depth markings, allowing the user to create faster, more accurate bends in ductwork. Made for durability and longer life and backed by a 25 year guarantee. The patent pending ergonomic grip design allows 2 hand positions: rearward grip for maximum leverage, and forward grip for maximum control. The flush pivot bolt will not hang up on material for easy use. The metal lock secures the tool for storage and is easily operated with one hand. This Seamer is built to meet the professional’s rigorous demands.