Features 4mm torx diameter and a 2mm security hole. With a little magnetism design, it is more convenient and practical for use. Plastic handle in ergonomical shape provide great comfortable grip, precise tip more secure fit. It is useful to open up electronic device, perferred for electrician, and repair shop for its versatile. Product Name: Screwdriver Material: Metal Shaft and Plastic Handle Tip Type: Security Torx ( T20 ) Tip Hole Diameter: 2m Torx Diameter: 4mm Shaft Diameter: 5mm Shaft Length (): 100mm / 3.9 inch Total Length: 175mm / 6.9 inch Handle Size (): 75mm x 20mm / 3 inch x 0.8 inch (L x D ) Handle Color: Clear, Red Weight: 890g Package Contents: 20 x Screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.