Salsa says........

The Firestarter Carbon Fork is our high-end rigid bikepacking fork. This sure-tracking platform features a carbon structure and 15mm thru-axle design, and the Three-Pack mounts on the forward portion of each leg allow use of Salsa Anything Cages or extra water bottle cages.

Axle-to-Crown Length: 483mm
Brake Type: Disc
S.H.I.S. Crown Race Diameter: 40
Fork Rake: 45mm
Front Axle Size: 15 x 125L, TP=1.5, TL=10
Front Axle Type: 15mm Thru-Axle
Front Hub Spacing: 100mm
S.H.I.S. Clamp Diameter: 28.6
Steerer Tube Length: 260mm
Steerer Type: Tapered
Wheel Size: 29er, 29+, 700c
Triple-boss Anything Cage mounts on front of fork legs