Allstar 0. 085 inch Thick 1 inch Tall x 4 inch Long Header Tab Kit (Pack of 25) has a header tab kit which is . 085 inches thick and measures 3/4 inches tall x 4 inches long. The header tab kit welds to headers to hold slip-on collectors in place or use to retain primary tubes on adjustable headers. The kit includes two pairs of tabs, two bolts and two hex nuts. The two tabs are highly recommended to secure each collector. They are sold as one pair and backed by a 90-day limited factory .