Di dalam pasaran besi beton dikenal adanya istilah full, gemuk, dan kurus atau banci. Besi kok gemuk dan banci, ada-ada saja ya. Besi full adalah besi beton yang telah memiliki dimensi yang sama dengan yang disebutkan. Misalkan saja besi 10 full, maka diameternya jika diukur adalah 10 mm pas dengan panjang standart  12 meter. Sedangkan besi gemuk adalah besi yang diameternya lebih besar dari yang disebutkan tapi panjangnya belum tentu standart 12 meter. Misalkan saja besi 10 gemuk, akan diperoleh ukuran diameter lebih dari 10 mm, misalkan 11,2 mm dengan panjang dapat  12 meter ataupun 11,6 meter.

Kemudian besi kurus atau banci, misalakan disebut besi 10 kurus, maka ukuran diameternya akan di kisaran 8 mm saja dengan panjang dapat dibawah 12 meter ataupun tepat. Semoga ini dapat berguna buat yang menginginkannnya.

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WASHINGTON — During a training course on defending against knife attacks, a young Salt Lake City police officer asked a question: “How close can somebody get to me before I’m justified in using deadly force?”

Dennis Tueller, the instructor in that class more than three decades ago, decided to find out. In the fall of 1982, he performed a rudimentary series of tests and concluded that an armed attacker who bolted toward an officer could clear 21 feet in the time it took most officers to draw, aim and fire their weapon.

The next spring, Mr. Tueller published his findings in SWAT magazine and transformed police training in the United States. The “21-foot rule” became dogma. It has been taught in police academies around the country, accepted by courts and cited by officers to justify countless shootings, including recent episodes involving a homeless woodcarver in Seattle and a schizophrenic woman in San Francisco.

Now, amid the largest national debate over policing since the 1991 beating of Rodney King in Los Angeles, a small but vocal set of law enforcement officials are calling for a rethinking of the 21-foot rule and other axioms that have emphasized how to use force, not how to avoid it. Several big-city police departments are already re-examining when officers should chase people or draw their guns and when they should back away, wait or try to defuse the situation

Police Rethink Long Tradition on Using Force

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