can I make .125" joints with this kit?

It does not come with a .125 spacer but you could make one. It could be made of metal or hardwood perhaps and you would have to find a .125 upward spiral milling bit. Do not use a rabbiting bit.

Is there any horizontal adjustment to make the tongues wider or narrower

The jig comes with 3 keys: 1/4, 3/8, and 1/2 inch. You can probably fabricate other sizes in between, but the jig is not big enough to accommodate much lager keys. They have another jig for that.

This picture doesn't match the one on rockler's site -- is this an older version? which one will i receive if i order it?

They only make two models, this one and the XL version which also does 3/4 cuts. There is no 'older' model.

I have a milling table and the distance from the strawberry to the rail where the rockler box joint is squeezed is 13.5 cm. would it be worth my table

Router Table Compatibility: Near edge of router table's miter track must be between 4-1/2'' and 6-1/4'' from the center of the router bit

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🔧 Master the Art of Box Joints — Precision Meets Power!

ROCK SOLID SETUP - Lock your jig securely with ergonomic knobs that fit perfectly into a ¾” miter slot for unmatched stability.
ALL INCLUSIVE KIT - Comes complete with sled, sacrificial fence, indexing keys, and easy-to-follow instructions—everything you need to master box joints.
BUILT TO LAST PERFORM - Crafted from robust MDF and glass-filled nylon, this jig withstands heavy use while maintaining precision.
PRECISION FINGER JOINTING - Achieve flawless, tight-fitting box joints with three interchangeable brass keys for ultimate customization.
SMOOTH STABLE OPERATION - Glide effortlessly on the melamine-coated MDF platform designed to reduce friction and prevent tear-out.

The Router Table Box Joint Jig by Rockler is a professional-grade woodworking accessory designed for creating strong, precise box joints. Featuring three solid brass indexing keys (¼”, ⅜”, ½”) for customizable finger widths, a low-friction melamine-coated MDF platform for smooth operation, and ergonomic locking knobs that secure the jig into a ¾” miter slot, this tool ensures stability and accuracy. Its durable construction and comprehensive kit make it an essential upgrade for any serious woodworker aiming to elevate their craft.

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Material	MDF with melamine coating, Glass-filled nylon
Brand	ROCKLER
Item dimensions L x W x H	12.99 x 11.26 x 3.7 inches
Color	Yellow (Yellow)
Style	Modern
UPC	733175503228 733175295024 733353556985
Global Trade Identification Number	05024763208546
Manufacturer	Rockler
Part Number	422866
Item Weight	3.78 pounds
Product Dimensions	12.99 x 11.26 x 3.7 inches
Item model number	422866
Is Discontinued By Manufacturer	No
Shape	Square
Item Package Quantity	1
Included Components	Router Table Box Joint Jig
Batteries Included?	No
Batteries Required?	No

Router Table Box Joint Jig - Finger Joint Indexing Keys w/Three Finger Widths ¼”, ⅜” & ½” - Stable MDF Router Fence w/Low-Friction Melamine Coating - Knobs to Lock Platform w/ ¾” Miter Slot

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