【HIGH QUALITY】These Nylon Insert lock nuts are made of 304 stainless steel, which have high hardness and won't be deformed. Excellent rust resistance makes it long last use.【SIZE & QUANTITY】This assortment kit has 7 different sizes, including 4#(15pcs), 6#(15pcs), #8-32(25pcs), #10-24(25pcs), 1/4"-20(40pcs), 5/16"-18(20pcs), 3/8"-16(10pcs).【FEARURES】These stainless steel hex locknuts are designed with nylon insert, making it capable enough to replace common lock washers and hold bolts more firmly.【PACKAGE】Total 150 pieces nylon insert lock nuts are packed in a sturdy plastic box, which allows you organize the lock nuts according to size neatly and conveniently.【WIDE APPLICATION】Insert lock nuts can be widely used in automobile, construction machinery, shipbuilding, etc. Suitable for use in home and office DIY, machinery assembly and other industry equipment. 【Specifications】 - Quantity: 150 Pcs - Color: Silver & White - Material: 304 Stainless Steel, Nylon - Size: 4# 6# #8-32 #10-24 1/4"-20 5/16"-18 3/8"-16 【Features】 - These Nylon Insert lock nuts are made of 304 stainless steel, which have high hardness and won't be deformed. - Lock nuts are used to fasten a bolt when joining materials together mechanically. - The purpose of the nylon insert is to prevent backing off or loosening from vibration. 【Package Included】 #4 ---------------15pcs #6----------------15pcs #8-32-------------25pcs #10-24------------25pcs 1/4"-20------------40pcs 5/16"-18-----------20pcs 3/8"-16------------10pcs Total: 150 PCS Stainless Steel Nylon Lock Nut Assortment Kit 【Wide Applications】 Insert lock nuts can be widely used in automobile, construction machinery, shipbuilding, etc. Suitable for use in home and office DIY, machinery assembly and other industry equipment.