Precision Reflex Internal Diameter Spacer Shim Pack 1/2 inch 05-6894. S shim packs with a variety of shims of different thicknesses to assist the installer in getting proper alignment. The ID of shims .5.510 and OD is .74.75 inches. There are 9 shims in the pack .010 (2) .005 (2) .003 (3).002 (2). Specifications for Precision Reflex 1/2 inch Internal Diameter Spacer Shim Pack: Manufacturer: Precision Reflex Color: Stainless Steel Inner Diameter: 0.5 in Features of Precision Reflex 1/2 inch Internal Diameter Spacer Shim Pack: These are S.S shim packs with a variety of shims of different thicknesses to assist the installer in getting proper alignment The ID of shims .5.510 and OD is .74.75 inches There are 9 shims in the pack .010 (2) .005 (2) .003 (3).002 (2). Package Contents: Precision Reflex 1/2 inch Internal Diameter Spacer Shim Pack Precision Reflex 05-6894: Internal Diameter Spacer Shim Pack 1/2 inch