81 PC Steel Gage Block Set000005 Space Block Harden Gauges Gauge Block Grade B Wooden Case Dimension: 7-1/2 in L x 12 in W x 2 in H *Rough Estimation* Weight: 5.65 Pounds *Rough Estimation* 9 Blocks -- .1001" Thru .1009" Step Of .0001" 49 Blocks -- .101" Thru .149" Step Of .001" 19 Blocks -- .050" Thru .950" Step Of .050" 4 Blocks -- 1.000 Thru 4.000 Step Of 1.000" Grade B Shop Accuracy To +/- 0.0000050" (1" & Less) All Gauge Block Sets Are Made To Special Standards To Resist Corrosion And Defacement Excellent Finish and Wringing Characteristics Guaranteed Accuracy of Flatness, Squareness, and Parallelism The Interior Separator Is Made Out Of Plastic, Therefore It Will Guarantee The Gage Blocks Won't Get Wet Or Rusty Wooden Case Included Qty: 1 Light Item