Genuine Bosch part 2600100588 — a 0.5 mm metal shim / plain washer used as a spacing shim in Bosch tool assemblies.

Key details:

- Part number: 2600100588 (also shown as 2 600 100 588).

- Size: M4 × 9.3 × 0.5 mm (inner diameter ≈ 4 mm, outer ≈ 9.3 mm, thickness 0.5 mm). Ideal when you need exactly 0.5 mm of spacing to restore proper alignment.

- Function: thin stamped washer/shim used to set clearance or preload in eccentric/roller or counterweight assemblies (keeps moving parts aligned and running smoothly). Found in the OEM parts diagrams for Bosch jigsaws/planing and sanding assemblies.

Example Bosch models this part is listed for (examples from factory parts lists):

- GST 12V-70 and GST 90 BE jigsaws; GSG 300 multi-tool.

- Also appears in parts lists for some Bosch portable planers (PHO200 / 0603258139).

What you get: a single, original Bosch shim (small, low-cost part) intended to replace a lost or worn spacing washer so the tool’s moving parts sit to spec again — handy when a 0.5 mm tolerance is required for quiet, vibration‑free operation.