The Round Diameter is 1-1/2" / 40mm (Before Shrinking) and 1/2" / 12.7mm (After Shrinking). For packaging convenience, we pressure the tubing into a packing size of 2-1/2" / 63.5mm Package: 1 pcs 1-1/2 inch black large marine grade heat shrink tubing roll and 1 pcs 1-1/2 inch red large marine grade heat shrink tubing roll, each length is 4 feet, total length: 8 feet 3:1 Shrink Ratio: Shrink ratio of our industrial heatshrink tube is 3:1, which makes a tighter seal. Shrinkage temperature: 80 - 125 ℃, professional connections made in seconds Adhesive Lined Heat Shrink Tubing: While heating, the adhesive lined comes out and seals the connection, creating water tight and long-lasting sealing Dual Wall Tube and Safer: Outer wall provides abrasion resistance. The inner wall creates a water tight sealing and strain relief. All heat shrink tubing is UL-listed and compliant with SGS, RoHS, REACH, CE, and ISO9001 standards Wide Applications: ELECFUN's waterproof shrink tube are mainly used for industrial, ship, automotive, wire links, anti-rust and anti-corrosion protection of solder joints, wiring wrap, cable protection, and audio and electrical DIY More Sizes: Our factory offers various color and size (e.g. 3/32" ... 1.25",1.5",1.75", 2.5",3",3.5", 4", and larger dia) small, big, rolls and kits, shrink ratio 2:1, 3:1, and 4:1. Support custom size, special usage tubes and high volume B2B purchasing.

ELECFUN is a subsidiary of a 20-old company with strong factory resources, and collaborating with some Fortune 500 companies. ELECFUN has specialized in heat shrink tubing, wire connectors, and battery cable end for years and has achieved unanimous acclaim in the industry. We provide top-quality heat shrink tubes and terminals at reasonable prices. And these products has UL certified, CE, SGS, RoHS, and ISO9001.

ELECFUN empowers electricians and DIY lovers to make professional electrical connections through quality products. Our industrial heat shrinking tubing for wires has excellent flame retardant and performance, weatherproof, good tightness, acid and alkali resistance, anti-aging, rust prevention, oil resistant, corrosion protection, durable wear-resistant. Our marine grade heat shrink wrap is perfect for boat, marine, automotive, rc radio, family garden, industrial equipment, electrical, eventronic control, wires insulation, connectors, DIY projects, etc. 

ELECFUN's heat shrink tubing comes in assortment kit, 4 Ft rolls, 8Ft roll, 10Ft roll, 20Ft roll, 50 Ft rolls and much more on Amazon. We offer a great variety of sizes (3/32", 1/8" ,3/16" ,1/4" ,3/8" ,1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 4", and larger) and colors (black, red, white, blue, clear, brown), also include 2:1, 3:1, 4:1 shrink ratio fully insulated thick tubings, fire against, wear-resistant and huge voltage resistance special material, e.g. silicone polyolefin plastic...

If you don't know the specific size requirements, just tell me the gauge of the wires, and we'll give you the most accurate choice. Our factory supports customized sizes and high volume B2B purchasing, please keep in touch by Amazon message.