Features:_x000D_ _x000D_ 12pcs kit includes the rubber washers. _x000D_ Work greatly as sealing washer and plug washer set. _x000D_ Widely used for fastener, plugs, water and hydraulic fittings. _x000D_ Great solid quality for DIY lovers to make, fix and modify things. _x000D_ Convenient and easy for use and storage. _x000D_ _x000D_ Specification:_x000D_ Color: black_x000D_ Material: Rubber_x000D_ Applicable pipe diameter: 1/2", 3/4", 1" (Optional)_x000D_ 1/2": Outer diameter 20mm, Inner diameter 12mm_x000D_ 3/4": Outer diameter 25mm, Inner diameter 16mm_x000D_ 1": Outer diameter 30mm, Inner diameter 20mm_x000D_ Weight: approx. 13-27g_x000D_ _x000D_ Package List:_x000D_ 12 x Washer ring 112pcs kit includes the rubber washers. 2Work greatly as sealing washer and plug washer set. 3Widely used for fastener, plugs, water and hydraulic fittings. 4Great solid quality for DIY lovers to make, fix and modify things. 5Convenient and easy for use and storage.