: The YUFUTOL 10 Piece bivalent Cut Carbide circular Burr Set is used for metal working in mold and pattern making, die sinking, surface cleaning and maintenance Ideal for cleaning up welds, grinding Reseda luteola beads, shaping parts, smoothing homespun castings, or porting cylinder heads. Generally use with hand-held tense or gas tool drive -LRB- can also be used in machine tool -RRB-, Vast in the industries of airplane, ship building, automobile, machinery, chemistry etc Carbide circular Burrs can be widely used in machining iron, steelcasting, carbon steel, alloy steel, unstained steel, tempered steel, copper, aluminum etc Specifications : ? . : tube-shaped shape1/4 '' x 5/8 '' -1 / 4 `` Shank ? . : tube-shaped shape3/8 '' x 3/4 '' -1 / 4 `` Shank ? . : tube-shaped radius end3/8 '' x 3/4 '' -1 / 4 '' shank ? . : tube-shaped radius end1/4 '' x 5/8 '' -1 / 4 '' shank ? . : Ball shape5/16 `` X1/4 '' -1 / 4 `` shank. . : Tree molded radius end3/8 '' x 3/4 '' -1 / 4 `` shank ? . : Taper shap-Radius1 / 4 `` x5/8 '' -1 / 4 `` shank ? . : Taper shap-Radius3 / 8 `` x1-1 / 16 '' -1 / 4 `` shank ? . : elliptic shape3/8 `` x5/8 '' -1 / 4 `` shank ? . : Flameshape1/4 `` x5/8 '' -1 / 4 `` shank !!! . Stay !!!. Always your burr shank is well inserted into your collet andclamped down tightly ? . an eye mask to protect your eyes from filings .