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The arbalest (also arblast) was a late variation of the crossbow coming into use in Europe during the 12th century. A large weapon, the arbalest had a steel prod (the "bow" portion of the weapon). Since the arbalest was much larger than earlier crossbows, and because of the greater tensile strength of steel, it had a greater force. However, the greater draw weight was offset by a shorter draw length, which limited the total potential energy that could be transferred into the crossbow bolt. The strongest windlass-pulled arbalests could have up to 22 kN (2,200 kilograms-force; 4,900 pounds-force) of force and be accurate up to 100 m (110 yards). A skilled arbalestier (arbalester) could loose two bolts per minute.