Introduction:<br> The adapter screw is designed with one ends of of 3/8", and the other end of 1/4".<br> Material: Metal<br> Color: Silver<br> Size: 16mm(Maximum diameter) x 20mm(height)<br> made of metal material, and silver plated surface<br> Suitable for all kinds of gears with 1/4" or 3/8" screw hole<br> <br>Package included:<br>1/4" Male to 3/8" Male Threaded screw Adapter1