1、【Adjustable Neck Angle】: The conical maple shims are designed to change the angle of the neck bolt. These shims eliminate the unwanted gap at the base of the neck, preventing moisture buildup and wood expansion that can cause the neck to warp. Ensures a solid contact between the neck and body to maintain tone. 2、【Convenient and Time-saving】: Pre-made conical shims cover the entire heel of the neck, saving time and effort in creating high-quality shims. Ideal for quick turnover in common repairs at repair shops. 3、【Versatile Adjustment】: The 0.25° shim offers maximum versatility and stacking them allows for precise adjustment of the neck angle. The 0.5° shim is commonly used and works well on Fender and many other bodies. The 1° shim is perfect for basses with rear-mounted bridges. 4、【Gradual Taper Specifications】: The 0.25° shim tapers from 0.030\" to 0.019\" (0.76mm to 0.48mm). The 0.5° shim tapers from 0.044\" to 0.010\" (1.11mm to 0.25mm). The 1° shim tapers from 0.078\" to 0.010\" (1.98mm to 0.25mm). 5、【Custom Fit and Design】: Made from solid maple wood to match the neck. Shape: 2-1/2\" x 3-7/8\" (63.50mm x 98.43mm). Blank shims designed for odd screw spacing, smaller neck pockets, and custom designs.