This is a standard covertech wheel that can be added on to your saber. Included is one covertech wheel and one screw. Available color options include polished aluminum, polished brass, or anodized matte black. The covertech wheel measures 18.4mm in diameter with an inner slot of 2mm for covertech clips. The included screw is an allen head M4x5mm. Aluminum and Brass options will include stainless steel color, Black options will include black color screw.