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How to Select The Right Bits for Through and Half-Blind Dovetails for the D1600
Through Dovetail Bit Selection To match the angle cast into every guide finger, all through dovetails are cut on the D1600 using 8° dovetail bits for tails and one straight bit for pins. The dovetail bit's working depth (carbide height) must be at least equal to or slightly greater than the thickness of your pin board (column B in the chart below). Choose the smallest dovetail bit you can (column A) to cut sockets for pins as narrow as possible for a look of hand-cut elegance. Always use the supplied 7/16" OD template guidebush or equivalent. The supplied 1/2", 8° dovetail bit (No.80-8) and 5/16" straight bit (No.140-8) are the workhorses used for work up to 13/16" thick. High Quality Bits Leigh carbide tipped router bits are among the best you can buy. Our carbide comes from Sandvik of Sweden, the world leading carbide manufacturer. Each bit is honed with 600 grit diamond wheels for superbly smooth, efficient cutting. Shanks are all 1-3/4" long to handle the thickness of the finger assembly. All Leigh bits are manufactured to ISO 9002 standards. Shank Selection Leigh highly recommends the use of bits with 8mm shanks (designated by -8 appended to Leigh bit numbers) in place of ordinary 1/4" shanks. The 8mm shanks, which have become the norm outside North America, fit easily within the inside diameter of 7/16" o.d. template guidebushes. They are considerably stronger and stiffer than 1/4" shanks, allowing smoother cuts and faster feed rates with a better margin of safety. Some router manufacturers offer inexpensive 8mm collets to fit their routers. Other routers with 1/2" collets, will accept the included Leigh No.172-8 1/2" to 8mm collet reducer. Your D1600 jig was shipped to you with 8mm shank cutters (optional 1/4" cutters available upon request). 
Half-Blind Dovetail Bit Selection
In half-blind joints, both pins and tails are cut with the same dovetail bit. The bit angle determines the depth of cut, therefore, a bit of a given angle must cut at or very near a specific depth in order that the pins and tails fit properly. For instance, the 1/2" 8° dovetail bit that comes with the D1600 jig must cut to a depth of 3/4". You cannot use this bit to cut half-blind dovetails in pin board (drawer front) stock less than 7/8" thick. To work with 3/4" or thinner drawer fronts, choose a bit with a cutting depth at least 1/8" less than the thickness of the drawer front. The included 120-8 14° cutter will allow you to work with boards less than 3/4 of an inch. For rabbeted or lipped drawers, choose a bit with a cutting depth slightly less than the rabbet's shoulder depth. Each of the dovetail bits below is available in a 1/4" or stronger 8mm shank.
Boxed Leigh Bit Sets for the D1600 Dovetail Jig Complete sets in your choice of 1/4" or 8mm shank bits Item 1607-8 7-piece bit set includes all of the extra 8mm shank bits used with the D1600. The extra strength and stiffness of 8mm shanks makes for faster smoother routing and is ideal for those who work in hard wood. The boxed set includes Leigh bit No.s 50-8, 60-8, 70-8, 75-8, 101-8, 112-8, and 128-8. Item 1607-8 Buy the 7 piece boxed set and save over individual bit prices!*...........$89.00 USD  Item 1607 7 pc. Bit Set ...... $89.00 USD 7 pc. 1/4" shank bit set for all D Series dovetail jigs. Set includes cutter #’s 50, 60, 70, 75, 101, 112 and 128
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Item 172-8 1/2" to 8mm collet reducer 1 1/4" long....$6.00 USD 