Great for 1/4-20 magic arm articulated arm tripod drilling rig replacement. Feature: 1.Thin type thumb nuts. This is an aluminum alloy flat nut. 2.The circular nut with is easy to assemble and disassemble. 3.Made of good quality aluminum alloy material, wear-resisting, and durable to use Feature:1., Thin type knurled thumb nuts. Uxcell 1/4 Inch Track Shoes Spikes Cross Country Replacement Spikes With Spike Wrench Red 50 Pack Knurled Thumb Nuts Uxcell Aluminum Alloy Hand Screw Nuts 1/4-20 X 10mm - Diamond Knurl Tripod Accessory Thread Size: 1/4-20; Outer Diameter: 10mm / 0., 39; Height: 20mm / 0., 78 Uxcell 1/4-20 X 10mm X 10mm Aluminum Alloy Hand Screw Nuts D Specification:Material: Aluminum alloyThread Size: 1/4-20Outer Diameter: 10mm / 0., 39inch;Height: 20mm / 0., 78inch;Package Content: 2pcs x Knurled Nuts This is an aluminum alloy flat knurled nut., 2., The circular nut with knurled is easy to assemble and disassemble., 3., Made of good quality aluminum alloy material, wear-resisting, and durable to use.