Designed for 1 or 4" hex shank bits, extension Bar made of High Quality Steel. Unlimited uses in automotive, hardware, hobby, home, etc. Must-have accessory set for power drills and impact drivers, strong built-in magnets hold bits securely in place, 1 or 4" quick-change hex shanks fit all power drills, 1 or 4" impact drivers and hand-held drivers, 4 different lengths of 1 or 4" hex shank extension bars, great for working to somewhere hard to reach. It has high hardness, non-slip, large torque, long life and durable. Length includes 60mm, 75mm, 100mm and 150mm, can meet your various needs. color:silver size:10 x 6 x 0.8 cm The number of shipments: 1 Note: Other items are not included here, other pictures only show the effect Due to the difference between different monitors, the picture may not reflect the actual color of the item. Because of manual measurement. Please allow deviation. Thanks!