3 sentences for 刚好 (gāng​hǎo — exactly)

1. 这袋大米刚好重一担。

   zhè dài dà​mǐ gāng​hǎo zhòng yī dàn.

   This bag of rice weighs exactly one 'dan' (about 50kg).

   Source: Dong Chinese Dictionary

2. 这件衣服的大小刚好。

   zhè jiàn yī​fu de dà​xiǎo gāng​hǎo.

   The size of this garment is just right.

   Source: Dong Chinese Dictionary

3. 这袋进口咖啡豆的净重刚好是一磅。

   zhè dài jìn​kǒu kā​fēi​dòu de jìng​zhòng gāng​hǎo shì yī bàng.

   The net weight of this bag of imported coffee beans is exactly one pound.

   Source: Dong Chinese Dictionary