F18 and F18M / F24 and F24M

Precise, Easy Box Joints

Fits 18" and 24" Super Jig Dovetail Jigs

Finger joints, also called box joints, add visually striking symmetrical design and amazing strength to any corner assembly.

Play Video

F18 and F24 Finger Joint Templates Overview video

Template Setup and Use


Remove the guide finger assembly and slide the F18 / F18M or F24 / F24M Template onto your jig in seconds.


To set up for pins and sockets, the template is shifted left or right along its bar to align with the joint size being routed, in this case 3/8". The control pin at the right end of the template secures the template in place. Each scale has both inch and metric measure.


The template is in the socket mode (see insets), and the socket board has been routed.


The template is shifted to the pins mode (see insets) while the board remains clamped in place. The pin board has been routed.

Joint Fit Adjustment

Leigh’s Elliptical Guide Bush technology ensures precise joint fit adjustment every time. A simple rotation of the unique elliptical barrel of the eBush can make fit adjustments as small as 0.001".


For a tighter or looser joint fit, simply rotate the unique elliptical guide bushing clockwise or counterclockwise.


Joint fit is easily and precisely controlled using Leigh's patented eBush System. Rotating the barrel of the eBush left or right, between 0 and 10, increases or decreases its active diameter. Each increment on the face of the guidebush equals a 0.002" adjustment to joint fit. Using a setting between the marks adjusts joint fit by an incredible 0.001" of an inch!
Two eBushes, e8 and e10 (one for each template comb size), are included with every F18 /F18M and F24 / F24M. All eBushes mount directly to many router bases. Some routers may require a Leigh template guide bushing adaptor. Learn more

Leigh Brand Router Bits

Leigh offers optional router bits for the F18 and F24 in HSS and solid carbide, or as boxed bit sets for savings. Learn more

Note: Leigh does not sell metric router bits.

Technical Specifications
A Pin Board Thickness 1/8" [3.1mm] 1" [25.4mm]
B Socket Board Thickness 1/8" [3.1mm] 1" [25.4mm]
C Board Width 29/32" [23mm] 23-21/32" [600mm]
D Pin Centers 3/16"– 2" [4.7 – 50.8mm]  
F18 / F18M Template
Length: 26.38" (670mm)
Width: 4.72" (120mm)
Height: 0.39" (10mm)
Weight: 2.92 lbs (1.32 kg)
Size: 36" x 12" x 2.5"
(914mm x 305mm x 64mm)
Weight: 8.5 lbs. (3.9 kg)
F24 / F24M Template
Length: 31-1/4" (79.3mm)
Width: 4-13/16" (122.24mm)
Height: 3/8" (9.5mm)
Weight: 3.31 lbs. (1.5 kg)
Size: 36" x 12" x 2.5"
(914mm x 305mm x 64mm)
Weight: 8.5 lbs. (3.9 kg)
Each Template includes:
e8 eBush (Leigh elliptical guide bushing)
e10 eBush (Leigh elliptical guide bushing)
Fully illustrated user guide
Pin wrench