https://compasscutter.com/circle-cutters Ideal for DIY projects and installation / repair jobs for roofing and flooring on carpet and thin veneer, etc. Great tool for making pipe holes and rounding corners in carpet and other uses in construction. Adjuter with ruler (cm) increments, for arcuate diameter size setting, Simple to use, adjust blade to the required size, place the pivot point in the center of the circle required, push down to grip and rotate to start cutting keep rotating unitl circle is complete. Cutting Diameters Minimum: 3cm Maximum: 16cm Cut circles on thin material or scribe lines on tough thick materials. An optional extra for this circle cutter is the CE-1000P extension bar for cutting larger circles from 15 upwards to 23cm in diameter, the CE-1000P extension bar is sold separately. Blade Specification (BC-1P) Blade width: 9mm Blade thickness: 1.0mm Blade type: Solid Blade colour: Silver Cutting edge: Pointed Razor sharp