SAW specialist grinding wheel dimensions: 145 x 22,3 mm x 3.0 mm for chain sharpener fits for example for the following devices: Maxx Progrinder, jolly, super jolly, jolly star, OREGON, Efco, Solo Jolly, speed sharp, Güde P 2500 as well as other chain sharpening devices that discs for this size. 3.0 mm for 1/4 inch, .325 and 3/8HOBBY the plates measure 145 mm outer and inner 22,3 mm. Depending on the supplier to one tenth of a millimetre in size is possible depending on your monitor settings. With the 3.0 mm disc allows you to semi and full chisel chain.