The 7/8″ pre-formed coil (MD99-601) is a heat resistant coil attachment for the Mini-Ductor® series.; Works best with ½" fasteners and smaller; The coil will last for several hundred uses or more subject to use; Use of the proper size coil, avoiding abrasion and overheating prevents premature wear to the coil; All coils are plated to eliminate oxidation and guarantee contact; The coil insulation is coated to resist abrasion – however, if insulation is breached, a new coil will need to be used; The coils are all flexible and can be bent or separated for a variety of applications; Includes; One 7/8″ heat resistant, pre-formed coil (5″L x 1.25″ O.D.) (1 oz.)