VIGRUE 715PCS M2.5 x 4/6/8/10/12/16/20/25mm Hex Button and Socket Head Cap Screws Nuts Washers Assortment Kit with Storage Box, 12.9 Grade Alloy Steel Black: Amazon.com: Industrial & Scientific
Cable Pulley with Steel Mount - 3.54 in. / 90 mm Diameter- Ideal for Lifting Blocks/hoists/Ladder Lift/Pulley for Gym Equipment, DIY Home Projects, Clothesline, Shop Lifts: Amazon.com: Industrial & Scientific