Made from Nylon 6 with 30% glass fiber content for added strength. Molded in zinc metal teeth for strength and durability. Button hex head retention screw makes this a very attractive handle. Temperature rating of -40F to +265F. Perfect for tool free fastening and clamping applications. Unique ICG design has reduced cavity area around the retention screw for less debris accumulation. Simply "lift and rotate" to position the handle for added leverage or maximum operator comfort.