This pack of 12 official Fender American Series Stratocaster/Telecaster Bridge Saddle Height Screws has four 1/4" (6.35 mm) short and eight 5/16" (8 mm) long adjustment screws all with 4-40 imperial thread used on American vintage style bent sheet steel saddles and modern block saddles (please note these will not fit bass and vintage Telecaster barrel saddles with the larger 6-32 thread). The short 1/4" screws allow the E string saddles to be set low without having the screw high above the saddle surface, making them more comfortable on the hand while playing.