Oka Creaser Beveller Tool Edge Stitching Groover Punch Leatherwork Oka STG1250Making a groove on leather sheet to sink a thread when you stitch leather. Tempered whole blade, black coating prevents rust. Using hard material with the central shaft so as not to damage the horizontal hole of the shaft when pushing it with the corner of the blade part when you fix it. Knurling the outer part makes it nonslip when you turn it to fix the blade part. Made in Japan