SK11 Square Ruler for JIS Class Same Scale and Thickness on Both Made in Japan (SK11) Construction, 30cm, 1, FSDD-30CKD, Sides,

Front scale: (Long side) Outer 30cm, Inner 30cm; (Side side) Outer 15cm, Inner 15cm Body size: Approximately 320mm (ends 160mm) x 15mm width x 1.3mm thickness, Material: Stainless steel Perpendicularity of the scale side: 0.1 mm or less per 100 mm Length tolerance: 300mm ± 0.2mm Specifications: JIS Class 1 scale, cm scale on both sides, mortise scale on the back, safety rope attachment hole.