Each shim is ground on 6 sides with two magnets on the bottom face, there are 7 different heights and 4 pieces of each height in a set.
The magnet sizes are carefully chosen so that the taller shims have enough magnetic force to hold them up sideways on a project while carrying some of the smaller shims. The thinner shims have smaller magnets which reduce the amount of force required to remove them.
The shims are ground on all 6 sides to an accuracy of +/-0.0009 which is less than 1/1024 of an inch! Think of a 1/32” reading on a machinist rule, now divide it by 32 again to get 1/1024 of an inch.
Shims are hardened to HRC 50. Just remember, to properly measure these you need to use a micrometer mounted on a stand and with the shim wiped clean. A pair of calipers in the hand with a dirty shim will not get an accurate measurement.
Thin Non-magnetic Shims
Each shim is processed on top and bottom sides only. The sides are not ground on these and slightly undersized from their nominal (2×1”) dimensions. The shims are not hardened, but have a black oxide treatment. These shims are accurate in height to within 0.005” variance (+0.0035” / -0.0015).
What Comes Inside
28pc Kit
| Height (mm) | Length (mm) | Width (mm) | Pieces in Kit | Magnetic |
| 5 | 50 | 25 | 4 | YES |
| 7.5 | 50 | 25 | 4 | YES |
| 10 | 50 | 25 | 4 | YES |
| 15 | 50 | 25 | 4 | YES |
| 20 | 50 | 25 | 4 | YES |
| 25 | 50 | 25 | 4 | YES |
| 50 | 50 | 25 | 4 | YES |
Extended 44pc Kit
| Height (mm) | Length (mm) | Width (mm) | Pieces in Kit | Magnetic |
| 5 | 50 | 25 | 4 | YES |
| 7.5 | 50 | 25 | 4 | YES |
| 10 | 50 | 25 | 4 | YES |
| 15 | 50 | 25 | 4 | YES |
| 20 | 50 | 25 | 4 | YES |
| 25 | 50 | 25 | 4 | YES |
| 50 | 50 | 25 | 4 | YES |
| 1 | 50 | 25 | 4 | NO |
| 1.5 | 50 | 25 | 4 | NO |
| 2 | 50 | 25 | 4 | NO |
| 2.5 | 50 | 25 | 4 | NO |