Features 1、12pcs kit includes the rubber washers. 2、Work greatly as sealing washer and plug washer set. 3、Widely used for fastener, plugs, water and hydraulic fittings. 4、Great solid quality for DIY lovers to make, fix and modify things. 5、Convenient and easy for use and storage. Specification Features: 12pcs kit includes the rubber washers. Widely used for fastener, plugs, water and hydraulic fittings. Great solid quality for DIY lovers to make, fix and modify things. Convenient and easy for use and storage. Specification: Color: black Material: Rubber 1/2": Outer diameter 20mm, Inner diameter 12mm 3/4": Outer diameter 25mm, Inner diameter 16mm 1": Outer diameter 30mm, Inner diameter 20mm Weight: approx. 13-27g Package List: 12 x Washer ring Package List