Shinwa Rules Co., Ltd. was formed in 1971, when three measuring-tool makers, Watanabe Doki Seisakusho, Hanyu Keiki and Watasei Doki, merged in the Tsubame-Sanjō region of Niigata, a centre of Japanese metalworking for centuries.
Shinwa has focused on accuracy from the start. It patented a calibration method for stainless steel rules in 1977, gained ISO 9001 certification in 1999 and became a JCSS-accredited calibration laboratory in 2001. The company opened an office in Dalian, China, in 1991 and a branch in Illinois, USA, in 2007.
Shinwa is now Japan's top-selling maker of metal rules. Its squares, rules, sashigane, marking gauges and levels are used every day by carpenters, metalworkers and makers who need measurements they can trust.
15cm 45°/90° Circular Saw Guide
15cm 45°/90° Circular Saw Guide
Regular price
$54.00
Regular price
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$54.00
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Compare every Shinwa circular saw guide by the cut you want to make: square, rip, any angle or full sheet.
Find your guideThe Shinwa 15cm Circular Saw Guide is a compact aluminium speed square purpose-built for circular saw work - not just a rafter square pressed into service. A lipped fence hooks securely over the edge of your timber or sheet material, so you can hold it one-handed while your saw's shoe rides flush along the guide's edge. The result: fast, straight, splinter-free cuts at both 45° and 90° degrees without needing to clamp a straightedge or set up a track.
At 238x238mm and just 275g, it's small enough to live in a tool bag or apron pocket, yet substantial enough to register accurately against timber, ply, and sheet goods. Works with any handheld circular saw with no adapters or clamps required.
Designed in Japan by Shinwa, manufactured in China to Shinwa's specifications