IRWIN Impact Performance Series masonry bits are built for maximum durability and long life with impact drivers. Engineered with a pressed carbide tip with aggressive cutting angles, these durable bits drill fast. They have a one-piece construction that withstands higher torque loads than standard q...

THRU-HULL CONNECTORS are made from high strength glass-reinforced Marelon. Ideal for use above or below the waterline. Must be installed with proper bedding compound. Recommend a maximum torque setting of 20 lbs. Series 250, 251 and 253. Model CF-251 Head Mushroom Thread Size 1-1/2 inch Length 3