Megapro 4 in 1 Pocket Socket Multi-bit Screwdriver (64IN1PS) Provides 4 nut driver sizes in one handy tool Light and portable at only 5 ounces with dimensions of 4.5 by 1.5 inches Handle has been molded from durable ABS plastic and has a textured cushion grip for added comfort Two ends with two sizes that telescope within each other Spring locked to keep the size you need in place and sizes included are 1/4, 3/8, 5/16, and 7/16 inch Made in the USA