This SMB top-quality precision light duty knife is popular with modelers of types for general hobby use. The knife is perfect for trimming and cutting lightweight materials. The precision ergonomic handle features and aluminum collet and finger grips for cutting control. Length: 5.75 (146mm) including blade. Handle diameter: 0.55 (14mm). Replacement blades store safely in case. For ages 12 and up. Light duty knife handle. Fits the following blades from most manufacturers, including X-acto, Excel, and Huron. Blades with 1/4 shanks. Item is comparable to. Hobbico / Revell RMXR6900. Demystifying blade / knife handle compatibility. Generally speaking, light duty blades (those with 1/4″ shanks) should be paired with light duty knife handles; medium duty blades (the majority of those with 3/8″ shanks) should be paired with medium duty handles, and the larger blades (such as #26 whittling blades, pull/razor saws, and certain other specialty use items, most of which also have 3/8 shanks) should be used with heavy duty knife handles. The blade shank is the squared off part of the blade that slots into the knife handle. It’s physically possible to fit 1/4″ shank into 3/8″ collet, but it’s not. Because light duty blades are mostly shorter than medium duty blades, the cutting edge of light duty blades may feel unnaturally close to the thicker collet of a medium duty handle. And it’s not possible at all to fit a 3/8″ shank into a 1/4″ handle. Satisfaction is 100% guaranteed.