The ARROW FASTENER - 721168 Insulated Cable Staples provide an effective solution for those seeking dependable fasteners made from durable materials.Insulated Cable Staples, T72, Wide Crown, 7/8 in Leg L, Steel, 300 PK These staples have a plastic insulation layer, often UV-resistant, that helps to protect the underlying cable from physical damage and electrical shorts. Please note that compatibility may vary based on the model of your tool, so it's important to verify before purchase.Constructed from steel, these insulated cable staples offer durability and strength.