Tri-Scribe: This versatile set includes two heads that will attach to nearly any metal rule, combination, or try square. Strike perfect arcs, circles and parallel lines, or use it as a marking gauge. Attaches to any metal rule or square blade up to 3/32" thick, and less than 2" wide. Two metal heads and two steel scribes per set.
Tri-Blade Accessory: Convert your Tri-Scribe to an ultra-precise marking gauge or veneer cutting tool by replacing a scribe with this simple blade holder. The holding post positions the blade at the proper angle for a perfect cut. Tri-Blade Accessory includes blade holding post, hex key, and a strip of disposable cutters. England.