No-Mar Skin Pins instantly spin up or down with the flick of a finger and require no pliers or installation tools. No-Mar manually operated temporary skin pins have a specially designed tip that provides maximum gripping strength and are ideal for close tolerance positioning of thinner layers of material.No-Mar manually operated skin pins feature a No-Mar plastic cap and are color coded for easy identification. No-Mar manually operated skin pins also known as temporary sheet metal fasteners, are widely used in the manufacture and repair of aluminum-skinned aircraft and in automotive repair, where it is used to temporarily fasten multiple sheets of material together before the pieces are permanently joined.