The unique one-piece locking mechanism with tilting head provides very fast clamping by hand - only final tightening by screw or hex. head driver is necessary to complete a perfectly airtight joint. Installation It's as easy as A, B, C,............ In addition, the one-piece locking mechanism also eliminates the possibility of lost or dropped screws - unlike two part fastening systems. The rounded edges and smooth underside of Tecfix banding prevent any risk of damage to the duct or pipe being clamped.