Spiral designed for trimming sheets of stack plastics and laminates in hand-fed applications. Double bearing provides smoother action around contour of The template., #51436, diameter (D) 1/4, cutting Height (B) 3/4, shank (D) 1/4, overall length (L) 3##51436 solid carbide spiral plastic flush trim 1/4 dia x 3/4 x 1/4 shank x 3 inch long double ball bearing