Gitzo quick release plates come in three different profiles (A, B and C). Each profile is offered in different lengths (short or square, medium and long) and with different features (graduated, anti rotation pin) and attachments (1/4 - 3/8). In the new collection we unified some 1/4 and 3/8 attachment plates into a unique new code that includes 2 screws for both 1/4 and 3/8 sizes. Having two screws available for each attachment size is ideal, above all for long plates, when heavy equipment or long lenses are used. As a general rule, it is preferable to always use the bigger possible attachment. In any case, even when the smaller screw needs to be used. In fact all Gitzo bolts and screws are made of high quality steel. attachment: 1/4'' screw; attachment 2: 3/8'' screw; color: gray color; length: 3.23 in.; material: aluminum; weight: 0.18 lbs.; width: 1.50 in.