Starter Push Switch as Lucas SPB106 with metal housing. 6/12/24v/200w with 2 Lucar terminals. As a starter switch it would also need a solenoid(some starter motors have a built-in solenoid/relay). Requires a 19.5mm (0.77″) diameter fixing hole; the black push is 15mm (0.60″)diameter and stands out 9.5mm (3/8″). The chrome ring/bezel is 22mm (7/8″) diameter. Suitable for a metal dash board or a panel not exceeding 6.5mm (“) thick.