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Extensions for Core Drill Bits

5/8" 11 Male Female Extension for Core Drilling
  • Core drilling extension adapters made with industrial grade heat treated steel.

    5/8"-11 male thread fits:

    • Dry core bits
    • Wet core bits 1-1/2" diameter and below

    1-1/4"-7 male thread fits:

    • Wet core bits 1-3/4" diameter and above
    • check In Stock: Dispatched within 24 hours
    • local_shipping Ground shipping arrive within 1-3 working days, air shipping also available
    • Fast Shipping: We will dispatch all items on same or the next business day. Our cutoff time is M-F 3:30 PM Pacific time
    • Free Returns: If your item is faulty or we have sent you something different to what you ordered, return it to us in the original packaging within 30 days and we will give you a replacement or a full refund. (Shipping cost not refunded)
    • Payment Safety: All transactions are SSL-protected and guarenteed safe
    • Your Privacy: We will never share your information with anyone.
Core Bit Threads Drill Arbor Price Quantity
info5/8"-11 Male 5/8"-11 Female - 6" Extension $29.99
info5/8"-11 Male 5/8"-11 Female - 12" Extension $34.99
info1-1/4"-7 Male 1-1/4"-7 Female 6" Extension $34.99
info1-1/4"-7 Male 1-1/4"-7 Female 12" Extension $39.99

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