Many kits use alloy steel with a galvanized finish, and several use stainless steel. Listings commonly reference 'Steel Alloy' or 'Stainless Steel' construction and note either a galvanized or stainless finish for corrosion resistance.
Kits commonly include flat (plain) washers and spring (lock) washers. Many product descriptions explicitly list 'flat and spring washers' alongside bolts and nuts.
Most kits include transparent, adjustable storage boxes with labeled compartments to simplify sorting and quick retrieval.
Listings note corrosion-resistant finishes and salt-spray testing: some alloy kits have a galvanized finish plus a 10‑hour salt spray test, while other alloy or stainless sets reference a 48‑hour salt spray test or stainless construction for rust resistance.
Kits are described as versatile for home repairs and DIY projects, with listings explicitly mentioning furniture assembly, vehicle repair and instrument maintenance.