Electric Nails Drill Bearings Bearing Speed: 60,000 RPM Bearing Grades: ABEC 7 1480 Diameter * inside diameter * Height 14mm*8mm*4mm 1260 Diameter * within diameter * Height 12mm*6mm*4mm 940 Diameter * inside diameter * Height 9mm*4mm*4mm 830 Diameter * inside diameter * Height 8mm*3mm*4mm 1060 Diameter * inside diameter * Height 10mm*6mm*3mm 1030 Diameter * within diameter * Height 10mm*3mm*4mm 1360 Diameter * within diameter * Height 13mm*6mm*5mm 1370 Diameter * inside diameter * Height 13mm*7mm*4mm 1040 Diameter * inside diameter * Height 10mm*4mm*4mm 1050 Diameter * inside diameter * Height 10mm*5mm*4mm R188 Diameter * within diameter * Height 12*6*4