Fangrui Product Details [material]6pcs Hss Twist Drills Are Made Of High-speed Steel Titanium-plated Material; 5pcs Masonry Drills Are Made Of Carbed Head, Tail Is Made Of 1045 Steel; 5pcs Wood Working Drills Are Made Of 1045 Steel. [16pcs Three Types Of Metric Drill Size]hss Twist Drill Size: 2cm, 3cm, 4cm, 5cm, 6cm, 8cm; Masonry Drill Size: 4cm, 5cm, 6cm, 8cm, 10cm; Wood Working Drill Size: 4cm, 5cm, 6cm, 8cm ,10cm. [efficient Drilling]: Twist Bit Sets A Fully Ground Helical Flute Design For Fast Particle Removal, Reduced Friction And Heat For Faster, Cooler Drilling Performance. [widely Usage] Drill Edge Allows Faster Penetration, And One Set Of Tools Can Be Used In Metal, Construction, And Woodworking Industries To Solve Problems. [what Each Drill Does]hss Twist Drill Bits For All Common Sizes Of Wood/cast Iron/aluminum/plastic/fiberglass; Masonry Drill Bits Have Excellent Hole-drilling Alloy Drills For Easy Masonry Drilling; Wood Working Drill Bits Use Point, These Specially Designed Bits Are Specifically Designed