*OCB-1 main unit is not included. The OCB-BS is crafted from carefully selected, 18mm-thick black granite, cut with precision and finished to a beautiful mirror finish. The added mass of the black granite (1.3kg) dramatically stabilizes the OCB-1 Series Ver. 2012 and prevents the power strip from lifting up when cables are plugged in. The compact 150mm square black granite allows for installation in tight spaces. The bottom is covered with a butyl rubber sheet for excellent vibration absorption, reducing floor vibrations. The included high-rigidity stainless steel screws securely fasten the OCB-BS to the OCB-1. Furthermore, the included silicone rubber washers isolate vibration transmission between the OCB-1 and OCB-BS. The OCB-BS is a must-have for anyone seeking even greater stability from their OCB-1 Series Ver. 2012. Key features of OCB-BS: Carefully selected 18mm thick black granite cut with high precision. Luxurious mirror finish. The added mass of the black granite dramatically stabilizes the installation of the OCB-1, preventing the power strip from lifting up when the cable is inserted. Compact size of 150mm square, allowing installation in small spaces. A butyl rubber sheet with excellent vibration absorption properties is attached to the bottom of the black granite to suppress floor vibrations. The included high-rigidity stainless steel screws allow the OCB-BS to be securely fastened to the OCB-1. Silicone rubber washers isolate vibration transmission between the OCB-1 and OCB-BS. *Note: The OCB-1 series prior to Ver. 2012 does not have screw holes on the bottom, so the OCB-BS cannot be attached. Material: Black granite, butyl rubber on the bottom Dimensions and weight: W150 x L150 x H20, 1.3kg Screw hole: φ5mm Accessories: M4 stainless steel screws x 4, stainless steel washers x 4, silicone rubber washers x 4 Wiring method: Insertion screw type (Maximum applicable diameter of single wire: 2.6mm / Maximum applicable cross-sectional area of stranded wire: 5.5sq) Compatible models: OCB-1 Series Ver.2012 (OCB-1 ST/OCB-1 SX/OCB-1 DXs/OCB-1 EXs)