Hottptyer 950pcs watch back O Ring Gasket Set 19 Sizes 12 to 30mm Covers gaps around cases during repair and watchmaker use rubber sealing washers 0.5mm

[CASE SEALING] These rubber gaskets install on the watch back case to cover the between the watch band and movement. They help support watch waterproofing during replacement work and provide a practical option for repair and watchmaker tasks. [950 PIECE SET] This set includes 950 new O ring gaskets arranged in 19 sizes. Each size has a 0.5 mm thickness to help match different watch back case gaps and keep commonly used replacement washers available for repair projects. [19 SIZES] Choose from 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 and 30 mm. The broad range supports work on watches with different case dimensions without limiting the repair to one gasket size. [50 EACH SIZE] Every size includes 50 pieces packed in a separate poly bag. The counted layout makes it easier to identify the needed diameter sort replacement parts and keep unused watch gaskets organized between repair sessions. [REPAIR USE] Suitable for watch repair and watchmaker work this assortment supports gasket replacement maintenance and hands on projects. Keep multiple diameters available for watch back cases that require different sealing washers.