Gardner Bender HST-999 Heat Shrink Tubing, 4 Inch, Black Provides excellent protection from mechanical abrasion and moisture - Flame-retardant polyolefin construction resists harmful UV rays, moisture, solvent and flame damage Inside diameter measures: 1 inch - finishes at  inch Repairs, strengthens and protects cable insulation to ensure strong connections Continuous operating temperature: -55C (-67F) to 135C (275F) Excellent product to repair appliance, extension or small electronic cords that are exposing bare wires, also ideal for general purposes uses including adding perspiration-resistant grip to tool and sporting handles or sealing rope ends Polyolefin shrink tubing shrinks under heat application to insulate wiring up to half its diameter Also useful for repairing cords and covering tool handles Makes strong rope loops and neat ends 1-Inch inside diameter before 1/2-Inch inside diameter finished