Plastic Ribbed for easy assembly and secure fitting. Ideal for a more professional finish on tubing enclosures on trailers, racking, shop fittings etc. Can also be used as furniture guides on furniture feet to help protect floor surfaces Product Mame : Rectangle Tube Insert Material : Plastic Color : Black Top Size : 20 x 40mm / 0.79 inch x 1.58 inch(L x W) Thread Size : 19 x 39mm / 0.94 inch x 1.57 inch(L x W) Overall Height : 17mm / 0.7 inch Net Weight : 34g Package Contents: 16 x Rectangle Tube Insert Only the above package content, other products are not included. Note: Light shooting 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.