These Wheatley clip boxes measure 6" x 3.5" x 0.875" We have three choices with combinations of clip sizes 10s, 7s and 5s. No. 10s are ideal for small flies or nymphs. No. 7s (small) will hold larger flies including Sea Trout. No. 7s (large) are made for small Salmon fies or lures. No. 5s are designed for larger Salmon flies or lures.