用于重型切割的钢锯中，哪一把的锯条长度最长？

This professional chrome-plated hacksaw frame includes a durable 12 in chrome steel blade, a strong aluminium die-cast handle, guarded grip, and blade tensioning device. It suits professional tradespeople and DIY users who need controlled, precise cutting and comfortable two-hand operation.

This high-tension hacksaw uses a 12 in, 24 TPI bi-metal blade with tension adjustable up to 30,000 PSI. It has soft-touch grips, onboard blade storage, 45-degree mounting, and a front mount for a reciprocating blade, making it well suited to professional and heavy-duty cutting.

The DeWalt 5-in-1 Hacksaw uses a 12 in blade and converts between five cutting configurations, including a low-profile saw, jab saw, and long-reach saw. Its high-tension frame and plastic handle suit professionals, maintenance workers, and DIY users handling metal or plastic cutting tasks.

This solid-frame hacksaw has a 12 in carbon-steel blade, a metal frame designed for up to 225 lb of tension, and adjustable 90 and 180 degree blade angles. It suits homeowners, DIY users, and tradespeople cutting plastic, wood, laminate, and similar materials.

This high-tension hacksaw has a 12 in blade, a lightweight die-cast aluminum frame, and an ergonomic handle for cutting in hard-to-reach spaces. It suits DIY users and tradespeople who need a durable saw for metal, PVC, and other general cutting tasks.