Laboratory Handpieces Bearings Specification: Bearing Size: #1480 Diameter * within diameter * Height 14*8*4mm #1260 Diameter * inside diameter * Height 12*6*4mm #1030 Diameter * inside diameter * Height 3*10*4mm #1030 Diameter * within diameter * Height 3*10*4mm Bearing Material:Stainless metallic SUS440C Bearing Speed: 60,000 RPM Bearing Grades: ABEC-9 Feature: four Size meet the purposes of people and dentists. Package include: 4pcs/set