Quadro koob yog hom koob tshwj xeeb, cov duab tshwj xeeb, cov txheej txheem siab yuav tsum tau ua, rau qhov smoothness ntawm cov khoom ntaub yog kev pab zoo, tshwj xeeb tshaj yog nrog cov khoom siv hauv paus, cov nyhuv zoo dua.
Kev xaiv ntau yam
• Koob loj: 36, 38, 40
• Koob ntev: 3 "3.5"
• Barb puab: G GB B
• Lwm cov duab ntawm qhov chaw ua haujlwm, tshuab naj npawb, barb puab thiab koob ntev tuaj yeem kho tau