ELECTRIC GRINDER KIT: package of various accessories such as sanding sleeves, spiral drills, collets, grinding inserts etc., which meet your different needs. WIRELESS ROTATION POWER TOOL: Built-in 900mAh lithium battery, disturb cable clutter and enjoy free mobile use. Compact and portable: ergonomic grinding pen as small as a pen, very convenient to use. 5000 ~ 15000 rpm, idle speed: 3-speed operation (5000/1000/15000 rpm), a key conversion, with indicators for each speed. Wide applications: suitable for intricate work such as grinding, drilling, carving and engraving on wood, jade, stone, etc. Features: Electric grinder kit: package with various accessories such as grinding sleeves, twist drills, collets, grinding inserts, etc., which meet your different needs. Wireless Rotation Power Tool Built-in 900mAh lithium battery, interfere with tangled wires and enjoy free mobile use. COMPACT AND PORTABLE Ergonomic sharpening pen as small as a pen, very convenient to use. 5000 ~ 15000 rpm. Idle speed: 3-speed operation (5000/10000/15000 rpm), a key conversion, with indicators for each speed. Wide applications: suitable for elaborate work such as grinding, drilling, carving and engraving on wood, jade, stone, etc. Specifications: Type: 32-piece kit/46-piece kit (optional). Material: ABS + SS Rated voltage: 3.6V Idle speed: 5000 ~ 15000 rpm (5000/10000/15000). Battery: 3.6V 900mAh Li-ion Max. Sanding wheel diameter: 3 mm. Collet Size: 3.2mm Item size: 163 x 30 mm / 6.42 x 1.18 inches. Item weight: 120 g / 4.23 oz. Package weight: 260 g / 9.17 oz, 290 g / 10.22 oz. Package size: 21 x 8 x 6 cm / 8.27 x 3.15 x 2.36 inches. Box contents: 32 PIECE SET: 1 x mill. 1 x collet. 1 x connecting rod. 1 x brush. 1 x twist drill. 1 x cutter. 1 x drill. 6 x sanding needles. 7 x sanding bit. 12 x sanding sleeves. 46 PIECE SET: 1 x mill. 3 x connecting rods. 5 x saw blades. 9 x twist drills. 9 x sanding bit. 10 x collet. 10 x sanding sleeves