1.Faster and More Efficient:These ceiling sleeves can be installed on electric drills to make the nuts faster and more efficiently, eliminating the need for manual twisting. 2.Accurate Height Adjustment:Equipped with an HD scale, these sleeves provide more accurate height adjustment, eliminating any guesswork. 3.Easy and Effortless Leveling:With seamless links and high concentricity, these sleeves make leveling a breeze, ensuring effortless operations. 4.Lengthening Design:Available in different lengths and sizes, these sleeves enable the twisting height to be extended, eliminating the need to stand on high places or ladders and making work more convenient and . 5.- and Sturdy:Made of high hardness chrome-vanadium steel with plating treatment on the interface, these sleeves are wear-, rust-proof, -proof and sturdy. Product Name:Ceiling Leveling Sleeve Total length:About 170 mm Working Depth:About 130 mm Shank diameter:About 6.35 mm Application:For Leveling Ceiling Colour:silver Material:Chrome vanadium steel Size:.10mm,12mm,13mm,14mm,17mm(Diameter) Package Contents: 5 x Ceiling Leveling Sleeves Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.