The milling compass set from Milescraft offers 3 products: 1. Small milling compass for circles from 40 to 300 mm. 2. Large milling compass for circles from 250 to 1320 mm. 3. Compensation plate for stabilising the router, especially when machining edges and narrow workpieces. The two aluminium rails have both metric and inch scales. inner as well as the outer diameter of the circles can be adjusted by a viewing window. The universal base plate fits all routers up to 178 mm in diameter. The ingenious TurnLock system of the base plate allows quick insertion and removal of the router in the compass mount, as well as in the compensation plate.