Specification: Three types: Nylon lock/Cap nut / flange nut Material: Stainless steel, nylon Quantity: 385 Pcs Packages Includes: 150 x Nylon locks 115 x Cap nuts 120 x Flange nuts The Package Contains 5 Sizes, included: M3, M4, M5, M6, M8 Nylon lock: M3 (50 pieces), M4 (40 pieces), M5 (30 pieces), M6 (20 pieces), M8 (10 pieces) Cap nut: M3 (50 pieces), M4 (30 pieces), M5 (20 pieces), M6 (10 pieces), M8 (5 pieces) Flange nut: M3 (50 pieces), M4 (30 pieces), M5 (20 pieces), M6 (15 pieces), M8 (5 pieces) Features: 1,Better Security and Firm Hold - This Kit has enough to replace lock washers and prevent bolts from being exposed. Lock nuts are highly resistant against turning, preventing the lock nuts from weakening and loosening under vibration and torque which reduces the strength of hold. Guaranteed to stay intact and in firm hold making virtually indestructible. 2,Here's the Can't Missed Cost-efficient Choice - It is one of the few hex lock nuts set in the market with high-quality and multifunctional quantity. Nylon nuts: It has excellent insulation properties, no magnetic, heat insulation and light weight; Cap nut: It fastens the exposed part of the outer cover to prevent moisture; Flange nut: Mostly used in pipe connections or workpieces that require additional nut contact surfaces. 3,Top Grade 304 Stainless Steel Made - Hex Lock Nuts in 5 common sizes for general, convenient, and handy use making it highly ideal for use professionals and DIY. Performs better compared to lock washers as it is made of non-corrosive stainless steel. 4,Variety of Application: Can be widely used in automobile, construction machinery, shipbuilding and etc. Allocating more quantity for the commonly used lock nuts. Box size: 10cm x 7cm(3.94inch x 2.76inch)