Number/Demonstrative + 把 + Noun (graspable object)
The classifier 把 (bǎ) is used to count objects that have a handle or can be grasped, such as knives, chairs, umbrellas, and keys. It is one of the most common measure words in Chinese beyond the general classifier 个. Use 把 between a number or demonstrative and the noun it quantifies.
我买了一把新雨伞。
wǒ mǎi le yì bǎ xīn yǔsǎn.
I bought a new umbrella.
桌上放着两把钥匙。
zhuō shàng fàngzhe liǎng bǎ yàoshi.
There are two keys on the table.
请递给我那把刀。
qǐng dì gěi wǒ nà bǎ dāo.
Please pass me that knife.