Specifications: Made of aluminum and alloy, the electric drill tools are durable to use. Humanized handle is non-slip and comfortable to grip, which ensures higher efficiency. Ideal handheld drill tool for PCB drilling, wood, plastic, paper, sheet metal, acrylic, aluminum, etc. Item Name: Electric Grinder Set Material: Aluminum, Alloy Model: T70201-2 Motor Model: 385 Motor Quantity: 148Pcs Chuck Range: 0.3-4mm Voltage: 3-12V (Fixed Speed Power Supply) Current: 6-24W Plug Type: 100-240V US Plug Feature: Rust-resistant, Widely Used, High Efficiency, Wood Drilling Electric Grinder Size: 12cm x 9cm/4.72" x 3.54" (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. Package Includes: 30 x Grinding Needles 10 x Twist Drills 105 x Grinding Tools 1 x Electric Grinder 1 x Drill Clamp Wrench 1 x Power Stepless Speed Controller