180-905 Model Code: AB (part# 180-905) This item features: -Center head locates centers of round workpiece. -Hardened measuring heads. -Square head sets rule at 90 or 45 to edge of workpiece. -Protractor head measures angles and for setting rule at desired angle to edge of workpiece. -Blade Material: Stainless Steel. -Type: Combination Square. -Price is for 1 Set. Model Code Model Description AABlade Length:12 in, 300 mm, Graduation(s):32, 64ths, 1, 1/2mm, Measuring System:Inch/Metric, Includes:Blade, 180-503, Square Head, 180-102, Center Head, 180-202, Protractor Head, 180-301 ABBlade Length:12 in, Graduation(s):8, 16, 32, 64ths (4R), Measuring System:Inch, Includes:Blade, 180-501, Square Head, 180-102, Center Head, 180-202, Protractor Head, 180-301