±æÀÌ ¹× Æ÷Àå´ÜÀ§ ¿É¼Ç ¼±Åà 1/2(12.7mm)/20°³ 5/8(15.8mm)/20°³ 3/4(19mm)/20°³ 1inch(25.4mm)/20°³ 1-1/4(31.7mm)/20°³ 1-1/2(38.1mm)/20°³ 1-3/4(44.4mm)/20°³ 2inch(50.8mm)/20°³ 2-1/2(63.5mm)/10°³ 3inch(76.2mm)/10°³