1/4" Thumb Screws with Yellow Tee Wing Knob 4 / 8 / 12 Packs Available 1/4-20 Thread Stainless Steel 18-8 (knob doe not interfere with length) Sizes Available: 1/4-20 x 1/2, 1/4-20 x 3/4, 1/4-20x 1, 1/4-20 x 1 1/4, 1/4-20 x 1 1/2, 1/4-20 x2, 1/4-20 x 2 1/2 Use drop down box for needed quantity size Head Thickness: 1/4" Head Width: 1 1/4" Butterfly Tee Knob is Pressed on to a socket cap screw For additional sizes, colors, threads, visit our store Here Thumb screws offer a hand-adjustment feature,which allows for simple action to fasten, tighten, loosen, or remove thescrews. However, they are also ideal for applications in which space is toorestricted to allow enough clearance for the use of tools to fasten the screw. Designers might choosethumbscrews for household, electronic and other consumer products, not just forthe ease of fastening but also to avoid the risk of over-tightening. They areparticularly beneficial for assemblies that require repeated removal andreinstallation. When used forremoval-and-reinstallation applications, such as safety covers or accesspanels, these bolts can reduce the amount of time required for maintenance orinspection. Their hand-adjustment design also reduces the incidence of brokenor stripped fasteners that might occur with frequent removal andreinstallation. For additional sizes,threads and colors, please visit our store Here These knobs provide asecure grip to position, tighten, and hold fixtures, machinery,and equipment. Made of thermoplastic, theyresist oil, grease, and solvents. Use color toidentify equipment controls and components at a glance. Made in USA Premium Quality Product Ships Fast Free