Vehicle/Brand Specific Clamps are designed to fit specific brands and models of trucks to accommodate attaching a cap in different rail configurations.
TL-150 fits Ford pickup truck rails.
A= 0 to 1-3/8" Clamping Range
B= 2-1/2” Major Reach
C= 1” Minor Reach Base
D= 1-3/4” Minor Reach Bracket
SEE CHART FOR DETAILS.