Turbo Solid Thumb Insert Duo - Black/White

Turbo Urethane Solid Thumb Slug – Bowling Ball Thumb Insert

Consistent feel. Quick release. Precision customization.

Achieve a comfortable, consistent thumb fit with the Turbo Urethane Solid Thumb Slug. Manufactured from 100% urethane, this solid thumb insert is designed to provide a smooth, quick release and dependable feel for bowlers who prefer a customized thumb hole.

Featuring a 72 Shore D hardness rating (±2), the urethane construction provides a firm, consistent surface that can be professionally drilled and shaped to accommodate individual thumb dimensions.

The pre-sanded outside surface makes the slug convenient for pro shop installation, while the center indicator mark assists with positioning during drilling and fitting.

Available in four sizes, the Turbo Urethane Solid Thumb Slug offers options for standard thumb-hole installations and specialized pro shop applications. The oversized 1 1/2" version is particularly useful as a quick-plug solution when moving or replacing a Switch Grip Outer Sleeve hole.

Key Features

• Brand: Turbo Bowling

• Product: Urethane Solid Thumb Slug

• Material: 100% Urethane

• Hardness: 72 ±2 Shore D

• Release Characteristics: Quick, smooth, and consistent

• Construction: Solid for customized thumb-hole drilling

• Exterior: Pre-Sanded Outside Surface

• Center Indicator Mark: Assists with drilling and positioning

• Standard Sizes: 1 1/8", 1 1/4", and 1 3/8"

• Oversized Option: 1 1/2"

• Standard Drill Depth: 2 5/8"

• Oversized Drill Depth: 3"

• Specialized Application: Oversized version can be used as a quick plug for Switch Grip Outer Sleeve hole adjustments

Performance Benefits

100% Urethane Construction

The solid urethane material provides a firm, consistent feel, allowing pro shop technicians to customize the thumb opening to match the bowler's preferred fit.

Quick, Consistent Thumb Release

Designed for bowlers who prefer a smooth thumb exit, the urethane surface supports a consistent release feel from shot to shot.

Pre-Sanded Exterior

The pre-sanded outside surface provides a convenient starting point for professional installation.

Center Indicator Mark

Each slug includes a center indicator mark to assist with positioning and drilling during installation.

Oversized Quick-Plug Option

The 1 1/2" oversized slug features a 3" drill depth and is particularly useful when moving or replacing a Switch Grip Outer Sleeve hole.