Five-Pattern Bolt Circle Marking Disc
This is a 128 mm layout disc for marking flange and wheel bolt circles without dividers or trig. It has five raised guide rings: 3 holes on a 40 mm circle, 4 on 60 mm, 5 on 80 mm, 6 on 100 mm and 8 on 117 mm. Every ring has one hole on the 0° line. All holes and the centre pivot are 3.4 mm, so a scribe, an awl, a 1/8 in punch or a 3 mm drill fits through each one. The 5 mm thick rings keep the tool upright as you mark. V-notches every 90° and ticks every 15° let you line the disc up with drawn centre lines.
tool layout bolt-circle drilling-template