APPLICATION RANGE SET OF 2 WRENCHES. Large adjustable wrench with one slot for gland nuts with 1/4” & 5/16” diameter pin holes, the claw is adjustable within the range of 2 to 6 inches. And the small adjustable wrench with two slot works on gland nuts with a pin hole size of 1/4 & 7/32", the claw is adjustable within the range of 1 to 3-3/4 inch (2.5 to 9.5cm). FUNCTION Highly compatible make this wrench set a universal fit. Use with a square breaker bar that provides extreme leverage to effectively loosening stubborn gland nuts. STURDY PINS .