型号                    内径（mm）                                  外径（mm）                         每卷长

PL-4-12                 11.4                                            16.1                                  50

PL-4-15                 14.1                                            19.0                                  50

PL-4-17                 16.6                                            21.5                                  50

PL-4-24                 23.8                                            28.8                                  25

PL-4-30                 29.3                                            34.9                                  25

PL-4-38                 37.1                                            42.9                                  25

PL-4-50                 49.1                                            54.9                                  20

PL-4-63                 62.6                                            69.1                                  20

PL-4-76                 76.0                                            82.9                                  20

PL-4-83                 81.0                                            88.1                                  20

PL-4-101               100.0                                         107.3                                 10

PLZ型可绕金属电线保护套管，外层为镀锌钢带，中间层为钢带，里面层为耐水电工纸。