Shinwa Rules Stud Finder Smart 35mm With Magnet (78592) Replacement needle: 2 pieces Product size / length: 161.5 mm, width: 21 mm, height: 17.5 mm Product weight: 28 g. Package size / length: 215 mm, width: 70 mm, height: 23 mm. Package weight: 44 g. Shinwa Rules Co., Ltd. (Shinwa Sokutei) is the leading manufacturer of measuring instruments having the largest share in Japan in the field of metallic scales.