For Select and for Specifications: M12 x 1.50 Thread Pitch, 1.38Inch Overall Height, 0.90inch Diameter, 3/4inch Hex, Radius Seating with Detachable Plastic Washer Cold carbon steel and tested to industry standards. construction. Stylish chrome finish. Utilizes traditional hex-body -flat seat design for fast and easy installation. Colour:Silver Material:Carbon steel Package Contents: 1set * M12 x 1.50 Thread Pitch(20pcs) 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.