mó shí shā lì
millstone grit
coarse sandstone
磨
mó
to rub
石
shí
abbr. for Shijiazhuang 石家莊|石家庄[Shi2 jia1 zhuang1], the capital of Hebei
砂
shā
sand
砾
lì
(bound form) gravel; small stone
