Twin Slot Shelving

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Got a twin slot shelving set but the uprights have huge screw holes? What fitting should I use? Needs to be 6cm long

Sapphire DU430BC Twin Slot Shelving Wall Fixed Upright; 425mm ; White ; Product Detail The Twinslot Shelving system is designed as a simple 'upright & bracket' arrangement, for supporting various types of timber shelves

vintage tyco slot cars Low cost versatile shelving system clothing system · Manufactured in steel · Pre drilled holes for easy wall fixing · 32mm Pitch · Sold in WoodscrewsSpecialist ScrewsDrywall ScrewsSelf Tapping ScrewsPackersTimber ScrewsConcrete ScrewsDecking Screws Size Please Select, 270mm, 320mm, 220mm Log