Original Bosch outer ring — part F016A57758 — a small retaining / spacer ring that secures the roller/drive shaft on cylinder-style lawnmowers (often described as an outer ring or roller-shaft clip).

Fits a number of Bosch / Atco / Qualcast / Allett cylinder-mower models; example model references found in parts diagrams include Windsor 14S (type F016L80597 / F016314003), Qualcast Classic 35S (type F016305203 / F016305042) and various Atco/Allett Balmoral and Kensington series machines (e.g., Kensington 17K / 20K).

Compact, original Bosch part number: F016A57758 — matches the type numbers stamped on the machine label (for example F016314003, F016305203, F016L80878) so you can verify fit from your mower’s type/serial plate.

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