Specific Feature and Material: HSS Metric Spiral Flute Step Drill Bits,
Spiral Flute design, better for faster drilling, prevent slippage when in chuck
Shank diameter: 10mm(0.39'') for 4-32; 8mm(0.31'') for 4-20; 6mm(1/4'') for 4-12
Hole Cutter step included: 4-12/20/32mm
Recommend the drilling speed of 250--400 rpm

Technical Details

Size (LWH): 5.7 inches, 4 inches, 1.2 inches
Product Details
Product Dimensions: 5.7 x 4 x 1.2 inches
Package Dimensions: 5.7 x 4 x 1.2 inches
Shipping Weight: 0.02 pounds (View shipping rates and policies)
ASIN : B00VJS8KRW