Chicago Pneumatic mechanical pokers are built to last and provide high acceleration inside medium to high slump concrete. Vibration, vibrating, electric pokers, generator Made with high-quality steel parts, VPM mechanical pokers are built to last and provide high acceleration inside medium- to high-slump concrete. With easy servicing and a long hose, they're an excellent choice for mid-sized construction sites. Use with VDD 3000 or VDG 3200 drive unit