Rotary Hammer Masonry Drill Bits.
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We've been selling the Hammer Bits for over 20 years and have found these to be a quality bit.
There are less expensive bits, but we've had customer after customer tell us how our bits last longer on difficult materials and drill faster.
While we are not the least expensive, we are very competitive when life of the bit and number of holes produced is considered.
All Rockhard bits are manufactured in EU.
Concrete - Masonry Drilling
Quality Products, specially recommended for fastening.
For Professional Drilling in concrete, brick and stone.
Special double-flute for fast, efficient dust removal,
TMS treatment (stress relief) for superior strength.
Meets all tool manufacturers sepcificaltion.
Specially brazed for superior performance.
Produced according to ANSI Standards.
What is SDS, SDS Plus and SDS Max?
There is a lot of confusion about SDS and SDS Plus and SDS-MAX and what kind of drills they fit. SDS or Slotted Drive System (or SDS Plus of SDS+) was developed by Bosch in 1975 for use in it's smaller rotary hammers. SDS (or Slotted Drive System) bits for hammer drills/rotary hammers allow the bit to slide in the chuck and enhance the hammering action of the tool. SDS-Max was developed later for larger hammers.
SDS and SDS Plus are different names for the same shank. Shank size is approximately 3/8" (10mm) in diameter, with 2 open drive slots and 2 closed retentions shots. Maximum hole size for these drills is around 1" depending on who makes the bit. Dewalt calls these drill SDS, Bosch calls them SDS Plus. Any bit in our catalog that is called SDS Plus or simply an SDS will fit any rotary hammer that specifies SDS or SDS Pus or SDS+.
SDS-MAX is a different size all together. Shank size is close to 3/4" (.7" or 14mm) in diameter. Instead of 2 drive slots there are 3 open drive slots and 2 closed retentions slots. This is designed for large hammers, with a maximum bit diamter of over 2"