The advantage of these rails for a variety of different uses is that a standard hexagonal bolt head in M-8 size precisely fits the track.
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Antal 40mm T-Track 50mm Hole Spacing 1m Long - Stainless Steel
Scale T Tracks Next Day Delivery – Rutlands Limited
Aweso T-Tracks Metric T track, Metric, Track
45 Type T Track With Scale 300 600 1000mm Aluminium Alloy T-tracks
The only T-Track with an included adjustable scale. Choose from four lengths. Can be cut to fit your jig exactly. Use the selector below to choose
INCRA T-Track Plus - 48 or 1220mm
LocaliQ
Running On The Track. Everything You Need To Know - Runners Connect