Machine shop: general machining, lathe & mill work, arc & gas welding, drilling, boring, cutting, honing; surface, OD & ID grinding services Gaseous fuels and additives, Fuel additives, Gaseous fuels, Anchor screws, Drive screws, Machine screws, Set screws, Sheet metal screws, Tapping screws, Wood screws, Drywall screws, Captive screw, Locking screws, Thread rolling screws