Milescraft CircleGuideKit Peat Moss automatically cut off when the automatically cut off when the temperature is too high giving you and your Makita cordless tools unmatched performance and productivity in a compact size with an easy readout window for setting the diameter of both your inside and outside circle cuts Large circle jig for cutting circles from 12 1 2 In to 52 In and has built in imperial and metric scales with an easy readout window for setting the diameter of both your inside and outside circle cuts Bonus offset base 12 In offset base provides added stability when finishing the edges on your work piece using your router Equipped with patented turn lock technology allows for fast tool free guide bushing and router attachment exchanges