This set of 3 includes a 1/4"

GF10330) for best results

The knee boards has rounded edges to prevent digging into concrete

or generics

diagonal cutting guide

Kompass Tool for Circular Cuts and Bullnose No Burn Pool trowel This set of 3 includesMOTOKOMPASS is a device designed to create rounded or rounded corner furnishing elements. Diameters you can perform: minimum 30 cm, maximum 100 cm. You can perform half bullnose and 45 miter (jolly) profiles. Half bullnose profiles can be performed on slabs and tiles with a thickness from 5 to 12 mm. Available radius: 1 4" 6 mm Radius Bullnose Blade, 3 8" 10 mm Radius Bullnose Blade, and 1 2" 12mm Radius Bullnose Blade. 45 miter (jolly) profiles can