Shinwa Japanese Aluminum Saddle Layout Square w/ 45 degree and 90 degree Sides Shinwa saddle square with 45 and 90 degree sides Overall size is 2 7/8  x 2  6  . Square marking capacity is 2at 90 degrees and miter capacity is 3 Made from brushed aluminum accuracy at 90 and 45 degrees guaranteed to be less than 0.2 mm per 100 mm or .002" per 5"