Cov Khoom Siv Tshwj Xeeb rau Cov Khoom Siv Ua Roj Hmab Roller
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Lub Log Sib Tsoo Thiab Grooving Alloy
Daim Ntawv Thov:Rau cov roj hmab sib tsoo lossis cov txheej txheem grooving nrog ntau yam hardness los ntawm kev xaiv cov grit thiab specification tsim nyog.
