Features:

• Drills 1/4-inch square holes for making mortise and tenon joints
• Austrian-made steel for added sharpness and longevity
• Fits Delta and Jet benchtop mortisers, as well as most other drill presses with 5/8-inch shanks
• Includes one drill bit and one chisel

Editorial Review:

The DELTA 17-908 1/4-inch chisel bit is designed for use with a mortising attachment mounted on a drill press to cut square holes for various sized mortise and tenon joints. This bit's 5/8-inch shank (chisel) comes with a 1-7/8-inch depth capacity and fits DELTA and Jet benchtop mortisers, as well as most other drill presses with 5/8-inch shanks. This bit's central drill removes most of the material while its hollow chisel squares off the corners of the hole. Built for professional use, this bit features high quality, Austrian-made steel for added sharpness and longevity. This set includes one drill bit and one chisel.

Customer Reviews:

Avg. Customer Rating: 1.5 / 5.0

Brittle bits not as durable as the OEM set:

These replacement bit/chisel sets are horribly brittle and the bits snap after a few strokes regardless of how careful you are clearing the chips or feeding at the proper rate.
The bare bits without chisels are listed on the side of the package:
1/4 - 17-916
5/16 - 17-917
3/8 - 17-918
1/2 - 17-919

Broke on 12 th hole:

I was making mortises in red oak and the bit broke on the 12th hole. I am not happy with the quality of the bit. Everything else I have that is Delta has has shown itself to be of good quality.

Junk!:

I ordered this set to replace the one that came with my mortiser. The original had cut probably 80 inches of 1" deep mortises. I expected that because it was "Austrian" that the Quality would be better. NOT! The amount of metal in the bit is roughly 1/3 the metal in the OEM bit. I should have known better,I put it in the Machine and made just two cuts before it snapped. I will be calling Delta in the morning to find out if they have anything available that will match the OEM Ouality. Tool crib customer... more info

Poor Durability:

First unit lasted 10 mortise cuts (3/8" deep)in red oak before bit broke. Unable to find replacement bit, bought second set to finish job. Bit lasted 12 mortises. If it is this fragile, replacements need to be readily available. I am not a rookie. This was not abuse of the tool.

Accessories:

[no image] Fine Woodworking (Magazine)

Woodworking Basics: Mastering the Essentials of Craftsmanship by Peter Korn (Paperback) - Usually ships in 24 hours

Similar Products:

Delta 17-909 5/16-Inch Chisel Bit from Delta (Tools & Hardware) - Usually ships in 24 hours

Delta 17-911 1/2-Inch Chisel Bit from Delta (Tools & Hardware) - Usually ships in 24 hours

Delta 17-910 3/8-Inch Chisel Bit from Delta (Tools & Hardware) - Usually ships in 24 hours

Also visit Main Street Tool & Supply Co.

Sponsor Results: