Applications - Maintain product that uses steel balls, such as ball bearings, turntable, drawer slides, casters, door locks; DIY projects like a keychain, or adding weight for your projects, etc. TOP-VIGOR 1Pcs 6708ZZ Deep Groove Ball Bearings, Z2 40mm x 50mm x 6mm Double Sealed Industrial Bearings, Chrome Steel Skateboard Bearings for Electrical Instrument Equipment Solid Carbon Steel Balls Bearing Balls Use for different kinds of ball bearings Bearings, Balls & Bushings: Business, Industry & Science 40mm Carbon Steel Ball Sourcing Map Pack Of 50 1/2 Inch Carbon Steel Storage Balls Precision Polished 40mm Carbon Steel Bearing Ball Material - Made of carbon steel which lowers the cost for your maintenance. You get a total of 330 chrome steel (G16 grade) bearing balls in 16 different sizes, from tiny 1mm all the way up to 12mm. They come neatly packed in a labeled box DIY Projects Such as DIY keychain, rolling ball project Equipment Repairing For repairing casters, drawer slides, locking mechanisms, semi-precision bearings, etc.