Steambow AR-Series-Vertical Foregrip with compartment Black. We have achieved this by significantly reinforcing the attachment of the grip to the crossbow and optimizing the cross-section. There is also a compartment on the inside for stowing a spare string or a stringing aid. Specifications for Steambow AR-Series-Vertical Foregrip with compartment: Manufacturer: Steambow Color: Black Package Contents: Steambow AR-Series-Vertical Foregrip with compartment Steambow 742: AR-Series-Vertical Foregrip with compartment Black