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Hammer Diesel Heavy Duty

Photo and specs courtesy of bowwwl.com. Reproduced with credit to the maker.

How it moves

Foul lineArrows · 15 ft44 ft · board 85.4° entry
Arcing turn (symmetric core). Dotted is skid, then the turn, then the roll into the pocket. Estimated from the coverstock, finish, core, and differential for a right-handed bowler with medium revs on a house shot. Lane conditions, speed, and layout move all of this.
Hammer

Diesel Heavy Duty

Hook potential6.5 (est.)6.5 of 10, estimated

How much the ball wants to hook, 1 (straight, a spare ball) to 10 (the strongest oil-eaters). The maker publishes no number for this ball, so this is estimated from the coverstock, core, finish, and differential.

Coverstock
Juiced Hybrid
Reactive hybrid
Core
Diesel
Symmetric
Factory finish
500/1000 Abralon, Powerhouse Factory Finish Polish
Color
Not listed
Released
2019-12-19
USBC
Approved 2019-12-17

Weights and specs

WeightRGDifferentialInt. diff
12 lb2.630.025—
13 lb2.560.030—
14 lb2.530.046—
15 lb2.510.046—
16 lb2.520.046—

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
500/1000 Abralon, Powerhouse Factory Finish Polish. Skims the oil and saves its energy for the dry part of the lane: longer skid, later and sharper hook. Polished and pearl balls. Surface changes over games, and a pro shop can take any ball either way with a pad.

Balls like this

Same coverstock and core type; the closest company for this ball in a bag.