Product Name:Multi-functional universal shaft electric drill set Material: universal shaft material: PE, shaft center: steel, batch head: steel Color: black Universal shaft length: 29.5cm/11.6inch. batch head: diameter: 6.4mm/0.25inch, specific dimensions as shown in the picture. Package contains: 1 set (11 pieces) x Multi-function universal shaft electric drill set (1 29.5cm universal shaft, 10 batch head combination) Note: The product dimensions are all measured manually, there will be a slight error, please understand! Due to different shooting angles and lighting, there may be some color difference between the picture and the real thing, please understand!