Specifications: This product can be used for drilling holes in wood and plastic. The straight shank twist drill is mainly composed of a shank and a working part, and the guiding part of the working part plays a role of guiding and preparing for grinding, while the chip groove is made into a spiral shape to facilitate chip guide. Made of high quality high speed steel, this product is durable, wear-resistant and easy to use. Item Name: Twist Drill Set Material: High Speed Steel Specifications: 1#: 50Pcs White Twist Drill, 2#: 100Pcs Twist Drill (50Pcs White Twist Drill, 50Pcs Titanium Plated Twist Drill) Surface Treatment: Titanium Plated Features: Durable, Drilling Tools, Wear-resistant The Total Length of Twist Drill: 1.0mm Type: 32mm/1.26" (Approx.) 1.5mm Type: 40mm/1.57" (Approx.) 2.0mm Type: 48mm/1.89" (Approx.) 2.5mm Type: 54mm/2.13" (Approx.) 3.0mm Type: 60mm/2.36" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. 1# Package Includes: 10 x 1.0mm White Twist Drill 10 x 1.5mm White Twist Drill 10 x 2.0mm White Twist Drill 10 x 2.5mm White Twist Drill 10 x 3.0mm White Twist Drill 2# Package Includes: 10 x 1.0mm White Twist Drill 10 x 1.5mm White Twist Drill 10 x 2.0mm White Twist Drill 10 x 2.5mm White Twist Drill 10 x 3.0mm White Twist Drill 10 x 1.0mm Titanium Plated Twist Drill 10 x 1.5mm Titanium Plated Twist Drill 10 x 2.0mm Titanium Plated Twist Drill 10 x 2.5mm Titanium Plated Twist Drill 10 x 3.0mm Titanium Plated Twist Drill