Four unopened boxes of Ejot insulation screws, 100 per box, 400 in total. Over-ordered for my project. Cost about £70+ per box online (incl VAT and delivery). Always stored in a dry warm place. If you are not in a hurry I may be able to deliver, location depending. £50 per box includes postage, delivery or collection in person. These are self tapping screws for fixing insulation to timber, esp good for wood fibre. Have integrated plastic washers and foam inserts to ensure there is no cold bridging.