Excellent for producing Broad & shallow groove ModelDia × Length Current Range(A)mmInchesB508B8×4×3555/16×5/32×14′200-250B510B10×5×3553/8×3/16×14′300-350B513B13×6.5×3551/2×1/4×14′400-450B516B16×8×355(510)5/8×5/16×14′(20′)550-600B519B19×9.5×355(510)3/4×3/8×14′(20′)600-650 DC Half Round Gouging Rods