Irwin 88885 Speedbor Boring Bit Set, 1/4", 5 Piece Craft And Hobby Made of non-porous glass that

Made of non-porous glass that won't stain

Virtually 100% water soluble

Contains a combination of grass seed

I-Beam handle

Suitable for Grout : Yes

Irwin 88885 Speedbor Boring Bit Set, 1/4", 5 Piece Craft And Hobby Made of non-porous glass thatHighlights: Shank Diameter: 1 4" Blue Groove point and cutting edge for faster chip removal overall drilling speed Double cutting spurs scribe the outside of the hole for reduced breakout and cleaner holes 40% thicker cutting edge and enlarged shank for increased strength longer drilling life 1 4" quick change shank reduces slipping in standard chucks Set includes (1) 3 8", (1) 1 2", (1) 5 8", (1) 3 4" and (1) 1" Number of Pieces: 5 pc. Cancer and