RECTANGULAR CARBONS are mainly used for removing weld bids and over-welded parts. The shape of rectangular prevents over removing of materials by excessive arc concentrating. TYPE NOMINAL DIMENSIONS STANDARD CURRENT(A) SHAPE (mm) (inch) 10 RD 305 5 x 10 x 305 3/16 x 3/8 x 12 250~300 RECTANGULAR 12 RD 305 5 x 12 x 305 3/16 x 15/32 x 12 300~350 15 RD 305 5 x 15 x 305 3/16 x 9/16 x 12 350~400 20 RD 305 5 x 20 x 305 3/16 x 3/4 x 12 500~550