Bosch Glass & Tile Drill Bit 1/4" x 4" (Model GT300)

Engineered for demanding glass and ceramic tile applications, the Bosch GT300 Glass & Tile Drill Bit delivers precision, durability and speed. Its high-quality carbide tip with a reinforced head resists cracking and extends bit life, while the three-flat shank design prevents slippage for secure, wobble-free drilling. Ideal for professional installers and DIY enthusiasts alike, this ¼-inch diameter bit bores clean, accurate holes in smooth surfaces without walking or skating.

Whether installing plumbing fixtures, decorative tiles or glass panels, the innovative geometry of this bit allows faster penetration and precise starts—no center punch required. Compatible with standard rotary drills, the 4-inch overall length provides ample reach for countersunk holes and hard-to-access spots.

Key Features

• Precision-ground carbide tip reduces bit walking and wander
• Reinforced head maximizes strength and prevents tip cracking
• Three-flat shank ensures a secure grip in the chuck
• Innovative flute geometry for faster drilling in glass and tile
• ¼" diameter with 4" overall length for extended reach