This ball ships professionally PRE-DRILLED for your convenience. We?ve simplified the process so you can hit the lanes faster. Based on the ball weight you choose, we?ll drill it to a standard hand size that fits most bowlers in that weight range: X-Small (6lbs): Ages 8 under Small (8?9lbs): Ages 8?11, women?s ring size 8?11 Medium (10?12lbs): Ages 11?15, adult ring size 10 or under Large (13?14lbs): Men?s ring size 10?12 or larger hands X-Large (15?16lbs): Men?s ring size 13+ or extra-large hands Want a different drilling size than standard? Email us immediately after checkout with your order number and your preferred size. Hammer 3-D Offset Assault Bowling Ball ? Unmatched Versatility and Power The Hammer 3-D Offset Assault Bowling Ball is a game-changer for bowlers who demand incredible performance across a variety of oil conditions. Whether you're facing fresh oil or medium-heavy oil patterns, this ball delivers consistent, aggressive motion and excellent control. Combining the Hammer High Rev Offset Core and HK22-Cohesion Hybrid Reactive coverstock, the 3-D Offset Assault stands out for its ability to adapt to different lane conditions while maintaining exceptional power through the pins. Designed for versatility, the High Rev Offset Core offers medium-range asymmetry, giving this ball a powerful yet controlled reaction on the lanes. Bowlers will appreciate its balanced performance and ability to strike with ease, making it a must-have for both competitive and recreational bowlers alike. Why Bowlers Choose the Hammer 3-D Offset Assault: ? High Rev Offset Core ? Provides a smooth yet aggressive motion, adaptable to a variety of lane conditions ?? Hybrid HK22-Cohesion Coverstock ? Delivers a consistent, strong reaction, even on fresh or medium-heavy oil ?? Versatile Performance ? Perfect for bowlers seeking adaptability and control across multiple oil patterns ? Aggressive Motion ? Ideal for powerful strikes and pin action, while maintaining balance ? Flare Potential (4-5 inches) ? Ensures high pin action and smooth lane entry ? High-Performance Design ? Engineered for serious bowlers who need durability and consistency Tech Specs at a Glance: Core Type: Asymmetrical ? High Rev Offset Core Coverstock: HK22-Cohesion Hybrid Reactive Finish: 2000 Grit RG (15lb): 2.48 Differential (15lb): .053 Mass Bias (15lb): .008 Flare Potential: 4 ? 5 Inches Lane Conditions: Medium to Heavy Oil Color: Red Weights: 12lb, 13lb, 14lb, 15lb, 16lb Performance Level: Hammer High Performance Scent: N/A Unleash Your Potential Whether you?re facing fresh oil or tough lane conditions, the Hammer 3-D Offset Assault will give you the control, power, and consistency you need to elevate your game. Reach for the 3-D Offset Assault, and enjoy superior performance with every shot.