ITEM NAME:Angle Block Set 30-60-90&45-45-90 Precision+/-20 Seconds,Angle Block Ruler B3O2 Angle Block Set 30-60-90&45-45-90 Precision+/-20 Seconds,Angle Block Ruler B3O2 High Precision: +/- 20 Seconds, 0.0001 per inch Precision Ground Solid Hardened Steel Thickness 0.25 Size: 17.5cm Color: silver material: metal Package contents: 1* 30 °-60 °-90 ° angle block 1* 45 °-45 °-90 ° angle block 1* box
