Internal metric size rings with a tapered design. Maintain constant pressure to prevent slippage of axles, gears, and bearings inside machinery housing handy kit for shop toolroom or toolbox. On hand when needed saves time and money. The plastic compartment box is easy to store. The Precision Brand® 218 Piece Metric Housing Ring Asst contains: 20 – 10mm; 15 – 11mm; 20 – 12mm; 18 – 14mm; 15 – 15mm; 18 – 16mm; 12 – 18mm; 10 – 19mm; 12 – 20mm; 10 – 22mm; 10 – 24mm; 8 – 25mm; 5 – 26mm; 8 – 28mm; 8 – 30mm; 8 – 32mm; 5 – 35mm; 3 – 36mm; 3 – 37mm; 5 – 38mm; and 5 – 40mm.